Assassination Classroom: Hidden Truths

Warning: Female Nagisa, AU

Declaimer: I don't own Assassination Classroom, I'll never be able to come up with something like it.

Summary: You can't stop something from happening, because in the end, it'll become reality in another time line.
The same people, the same classroom, the same teachers, the same mission. That is the class of 3-E but there is one key difference.
-or in which Nagisa is the female we all thought he was.

Chapter 1: A Mission for you

No one in the class knew what to do, it was already second period –math- yet Yukimura-Sensei had yet to show up. Sure there were times when she would be late, half a period at most, but never a full one. Or maybe the 24 students were looking too much into it, really they know why their teacher had yet to show up. She left them.

Left them for the bigger more paying, nicer job at the school grounds. A proper teaching job instead of wasting time on them. The End Class. Who have little to no hope in getting back into the higher classes, no hope in getting a job that'll pay what they need. Really who would want to stay and look after them?

Everyone's own thoughts where broken off when they heard a light knocking on the door before it opened showing a short female dressed in the female Kunugigaoka school uniform that consisted of a grey skirt and blazer -button upped- that both have black stipe outline, a white, long sleaved button up shirt and a black tie along with black, knee high socks tucked into black school shoes.

The female held a head of green hair that sat to look that some kind of small pointed eared animal ears, hazel coloured eyes that darkened as they got closer to the pupil. "Ah, sorry to interrupt." She tapped the floor with the top of her toes and gave a forced smile. "But I'm the new transfer, Kaede Kayano."

There was not one eye that wasn't looking at the girl. She flinched back at the number of different looks she got. "Umm… This is Class 3-E right?" she questioned, taking a look at the sign above the door, before her eyes were drawn to movement in the first line of desk.

A male student stood from his seat, longish, somewhat spiked, raven hair, along with light brown eyes that made contact with hers. He wore the male Kunugigaoka school uniform that consisted of grey trousers and blazer -unbutton-, both with a black outline, a white, long sleaved button up shirt, and a black tie, he personally held an addition of a black waistcoat.

He walked around his desk to properly face the newcomer, "I'm Yuuma Isogai. Um," his arm reached to scratch the back of his neck as he gave a laugh, "I honestly didn't know we were getting a new student, much less a transfer." His arm fell back to his side as he turned to look over the class members, "Did Yukimura-Sensei say anything to you guys about a new student?"

His answer was a simple shake of the head from a few students, the rest not even bothering to do so, if someone had been told it was highly likely another two or three others would know and one of them would've giving a sign to say so. Isogai let out a sigh before giving a half smile towards the transfer. "Well, normally -if this was normal- we would have brought in another desk for you but we haven't been told a thing."

The raven's eyes landed on an empty desk in the second row, fifth from the door way. "…Does anyone know when Akabane-san is due back from his suspension?" It was silent before but this time it seemed different, as if he'd ask something he shouldn't've, something that was known no one knew the answer of, didn't want to know. People's eyes dropped down to their desk or looked anywhere but Isogai and Kayano, making the female shift slightly.

"End of the week." Two shades of brown followed the voice -along with a few others- to a female student who sat on the window side of the empty seat. "He comes back at the end of the week."

The most noticeable feature of the female was the colour blue. She held a head of clear, sky blue hair that was pulled into high, twin tales which just touched her shoulders, equally blue eyes that slowly darkened towards the pupil. She also wore the female Kunugigaoka school uniform over her petite frame, only difference was that she rolled her sleeves up half way showing red ribbon tied to both wrist and wore black sneakers.

Isogai blinked at the small teen that was the only one who made eye contact with them, before giving a smile, "…'kay, well Nakamura-san, Nagisa-san would it be fine if Kayano-san sits there until further notice?" He looked over at the three females mentioned, silently asking them all for permission.

"Why not, it'll be fun right?" The other female student that sat on the other side of the empty desk to the blue haired one gave a grin, her own sea blue eyes lighting up in excitement as she pushed her shoulder blade length blond hair away from her eyes. She also wore a female Kunugigaoka school uniform but instead of a blazer she wore a pale yellow/cream coloured woollen, button up jacket.

Both sets of blue eyes closed as the owners gave a smile indicating that it was fine. Isogai turned back towards the transfer his own smile still in place as he gave a nod before taking a step away allowing Kayano to walk over the her desk. Her steps didn't hold any hesitation as she walked to the front of the class and gave a bow. Coming up she held a smile.

"I'm Kaede Kayano, I look forward to working with all of you."

The class gave up whatever hope they still had for their teacher to show up a while ago, so when the door opened the second time that day during a lesion -this time the last one of the day- everyone was somewhat on edge before they caught sight of the male that walked into the classroom, his strides full of purpose.

He held the attention of everyone in the room, his raven hair swept back, allowing his obsidian eyes to look over the room without a problem. The much older male wore a black suite with a white dress shirt with a black tie and black dress shoes.

Something in the air changed when he nodded over towards the door giving his permission for whoever was out there to come in. Another person dressed in a similar out fit to the unknown male entered the room, only he held an ear piece and sunglasses.

"I'm Tadaomi Karasuma from the Ministry of Defence." The male who stood at the front stated, somewhat effectively drawing the attention to himself instead of letting some student's eyes follow the movement of the other guy who went over to the windows and placed something on the ledges and handle. "What I'm about to tell and show you must never leave this room, this is completely need to know."

That got the attention of everyone, who would want to tell whole of Class 3-E something that is 'need to know'? The class may be the lowest but that didn't mean they didn't know that when something was need to know it linked to something to do with the government, sometimes even the world. So why would they come to this class, the class indicated the 'End' of whoever was in its future.

Karasuma once again nodded towards the door, the guy who came in beforehand had finished whatever he was doing and now stood to the side of the other.

No one was sure of their thoughts when they saw what entered the room next. It couldn't be classified as human, not by any means. First of it was bright yellow, held a number of tentacles, had a round head, a grin that covered half of his face that looked like how the moon now was and very small, round eyes, nothing that would be coincided to be remotely human. The thing wore a black graduation hat with a golden rope like thing, black graduation robes with parts altered into the different colours of gold, purple, maroon and white. It also wore a strange black tie that held the shape of the moon on it.

The thing didn't show any sign of discomfort as he stood in the place where Karasuma once stood with two guns pointed at its head, one from another guy who entered with it and the other from the guy who came in beforehand.

"Nice to meet you. I am the one who blasted the moon into the shape it is now." The thing -he- said it as though he was discussing how his day had been, instead of confessing that he performed something that was now more than likely considered a terrorist plot.

It took a moment for the words to register in the students minds and as though it was rehearsed a number of times, everyone's face fell into the same expression and all let out the same sound. "Huh?"

The thing continued to talk, "I also plan the do the same thing to the earth next year around the same time. And now I am you teacher, I look forward to working with you all."

Once again every students expression fell, and their thoughts ran in sink 'There are a number of things wrong here, don't we get a say in this!?'

Karasuma stepped up, "Again, anything discussed here is need to know and a state secrets." He took a deep breath and let it out, "I'm just gonna be blunt, I want you to kill this monster."

Everyone let out sounds of astonishment but only one person spoke, asking one of the many questions they wanted answered. The male student held light brown hair that could be debated as orange shaped in a bowl cut, emerald green eyes that looked on in confusion, he wore the male Kunugigaoka school uniform but only the trousers, white button up long sleeved shirt and black tie with black sneakers. He sat next to Nakamura and behind Isogai.

"Err? You mind explaining exactly whatthat is?" Kouki Mimura pointed at the yellow being, "Is that some kind of alien or something that's come to kill us?" Everyone raised an eyebrow at the reaction he was given.

The creature started to wave its tentacle arms around while making a stomping motion, "How rude! I'll have you know that I was born and raised on Earth just like you!"

Nagisa blinked 'He was?'

Karasuma's expression never changed and didn't look at any particular student, "I'm afraid I can't discuss the details, but he is telling the truth. This creature who did damage to the moon will destroy the Earth come March next year. Only the world leaders and those that have to know, know about this. If any information about this guy gets out, the whole world will fall in to panic.

"Your job is to kill him in secret before either of the two happens." The dark haired male reached into his suite jacket, "In other words…" grabbed something and flicked his arm out towards the yellow things face without hesitation. The class let out a sound of shock when they saw the green knife with the letters S.A.A.U.S.O in white along with the words that made up those letters in the place where the thing stood, "… an assassination." Only for it to return to stand on the other side of Karasuma, who retaliated and moved to stab once again.

"But this guy…" He was turning before he finished his stab, and made for another, "…is extremely fast." He missed again but didn't let that stop him from taking a slicing motion behind him, "You try to kill him…" his back now faced the class and the students view was obstructed by the yellow thing, its tentacles holding onto something. They couldn't see his expression, nor did they know him very well, but they could tell Karasuma was irritated, "…and instead he ends up grooming you."

Before the man moved to stab the thing again, its head turned pink before disappearing. The whole show sent off blast of air making the students put their arms up to block it. Karasuma continued to speak pausing in his assault, "This super being holds the power to turn the moon into a crescent permanently. His top speed is that of Mach 20! In other words if he gets away, we'll be left helpless until the day of the Earths destruction."

All the while the thing held up equipment one would use to tidy their eyebrows and looked over his work, before coming to a stop and put the three things away in a case, "And that wouldn't be any fun, so I made the government an offer: I don't want to be killed but..." A yellow tactical made its way onto Karasuma's shoulder, who in turn twitched at the contact, "If I become the teacher of Class 3-E at Kunugigaoka Junior High School, then you are welcome to try."

Every student felt sweat form on their skin, and again their thoughts ran together, 'Why?!'

Karasuma twitched even more when the tactical didn't leave his person, "We don't know what he's after. But the government was forced to agree, on the condition that he doesn't bring harm to any of you students. As to why, we have two reasons: First, with him coming to this classroom every day we can keep an eye on him and second, it gives some thirty people the opportunity to kill him at point blank range."

It was silent for a moment,

But that was quickly thrown away by a number of students, all asking questions some simular, others different, but the questions and cries fell on deaths doors as soon as Karasuma started to speak again.

"Success will be rewarded with 10 billion yen."

Every one froze, before they strutted eyes wide -some even having the yen symbol glowing in their eyes- as they looked for any sign of this being one big joke 'T-ten billion!?'

Karasuma mentally grinned knowing he had them, he knew the basics of their personal files they all needed the money one way or another, some more than others. "It's only right. It'll be a successful assassination that will literally save the Earth. Luckily, he doesn't think much of you." His eye sight shifted over to the yellow thing, its round face now held stripes of green and yellow. "See? Those green stripes means he mocking you!"

'What the hell? What type of skin is that!?'

"Obviously! If the government can't kill me, what hope do you have?" the students faces fell grim but not for what the creature was thinking, it was because they're Class 3-E, they stood even less of a chance than anyone. "Even when they sent their cutting-edge jet fighters after me," he paused, waving his tentacles around more, "I ended up giving them a coat of wax in mid-air!"

The classes thoughts snapped out of their flunk at that and again felt sweat fall, 'What's with all the grooming?'

A lady with short brown hair and dark eyes rolled in a trolley, she also wore a black suite with a white dress shirt with a button undone. Along with her came a male much like the other two unknowns ones but he carried metal cases.

"In any case, you must find a weak point in his defence and strike at it." Karasuma pulled out the green knife he was using before, "The government will provide the weapons and ammo that you can use, they won't hurt humans, but will work on him."

"You must keep this a secret form any outside force, you can't tell your friends or family. There is no time to waste, if the Earth disappears we have nowhere to go!" He finished, allowing for their target to speak

"And that's the long and short of it, now let's make the most of your remaining year!"

Everyone was on edge, it had been a day since they were given this task and it took a bit for it to sink in, for some it was still sinking in. They, Class 3-E had to kill their teacher before next year of schooling. Everyone sat in their seats, waiting for their teacher to turn up and even though he had only been their teacher for a day, they knew he was going to turn up in any moment.

Some kind of gloom hang around their heads as they waited for him to turn up, today they were going to try to kill him, sure yesterday they had a few tries, but that was for them to get use to the weapons they'd been given and learn how they work it wasn't like they had held a real gun before.

The windows rattled indicating that their target was here and almost immediately they heard the sound of his tentacles falling and sliding on the warn floor boards. Some people twitched, others swallowed dryly, but all of them felt nervous, questions of doubt run through their minds but they couldn't pull back, not with the door opening, not now.

Their new found teacher made his way towards the desk that sat in front of the black boards, one tentacle placing the roll book down. "Well then, let's get started." A number of tentacles appeared, he could feel that something was going to happen and he couldn't hold in his excitement. 'I figured it would be around next week that they would start with assassination attempts, guess there's more to this class than I first thought.'

"Student on duty, on you command." He knew who and what to look out for, because as soon as Nagisa Shiota gave the word they would attack, it was an obvious attack plan, a simple one as well but he did expect much from them, not yet. They had only just entered the world of assassination after all.

She didn't so much as hesitate with her words following after the teachers words like it was any other classroom, only stuttering once but her voice ran loud and clear, "S-Stand!" To them their reaction may have been in time, but he knew that some moved before while others lagged behind. "Attention!" Everyone aimed or adjusted it so they wouldn't hit anyone, they may have been told it won't harm them but none of them wanted to find out.

One last command.

"Bow!"

Shots fired.

"Good morning." The creature simply said, not batting an eye at the BB's that shot towards him as he side stepped them, he continued on as though he was any other human teacher that wasn't having an assassination attempt on him. "Fire all you like, I'll just take the attendance." No one noticed him pick up the small thin book only that one moment it was on the desk the next in his hand. "Isogai-kun?"

"…!"

"I'm sorry but you'll have to speak up, I can hear you over all this gunfire." The newbie teacher said, still moving between the shots without any problem.

"Here!"

"Okajima-kun?"

"Here!"

"Okano-san?"

"Here!"

A few minutes later the attendance had been called out, the end result was an unknown number of BBs lying on the floor, some students exhausted from the lack of adrenalin that was letting them keep the mindset they held to perform such a task, while others looked on with expressions of unhappiness at them being unable to hit their target once.

"All right, no absentees." the yellow creature closed the attendant's book with a snap after looking over the roll once more, completely passing the first name on the list. He held up one of his main tentacles and rolled on of the ones that split off from it down, his face colour changing to one of orange with a big red ring. "Excellent! That makes me very happy."

Nakamura held a hand to her hip, trying to get air back into her lungs only to let it out in a frustrated sigh, "He's too fast."

Her complaint was soon followed by Isogai who lowered his air M4 Assault Rifle down, "So the whole class shooting at him head on doesn't work?" It wasn't much a question but more exhaustion laying over his observation.

Nagisa looked down at her own air rifle, 'He's too fast to follow… how are we meant to kill him?'

"Too bad." The teacher continued while making a jabbing motion towards the students, "Not a single bullet hit me." He let his tentacles fall into a motion that looked as though he was shrugging. "Methods that rely on sheer numbers lack any individual thought."

Nagisa's head shot up, blue tails bouncing slightly, 'Why…'

"Line of sight, barrel position, the movement of your fingers; each and every one are easy to read and far too simplistic. You need to add more into your plan and think it over. Otherwise…"

'Why is he giving us advice? We would've noticed over time, but instead our target is telling us where we are going wrong and how to improve on that.'

"…you'll never be able to kill me at my maximum speed of Mach 20."

"Like, hold on now…" The students gazed moved as one towards the guy who spoke. The male held mid-short orange brown hair and somewhat matching eye colour. He wore the male Kunugigaoka school uniform but instead of the grey and black blazer he wore a yellow/cream coloured woollen jumper with the buttons done up much like Nakamura. He stood in front of Kayano

Hiroto Maehara pointed towards the classes teacher, "There is no way you seriously dodged all of those!"

Tomohito Sugino -who sat in the seat behind Kayano- agreed as he picked up one of the pink BBs and brought it up to inspect it with one blue, almost grey eye shut, the other squinted at the BB at his fingertips. His short raven hair fell a shade lighter than the other ravens in the class, he wore the male Kunugigaoka school uniform much like Mimura only he rolled his sleeves up and wore red sweat wrist bands on both his arms.

"They are just BBs after all sensei." He lowered the round down and looked at the teacher both eyes open, "I mean you coulda just stood there without a problem." Sugino's words where met with others of agreement.

The creature simply watched as most of the students tried to talk over each other in their agreement. "Well then," He extended a tentacle towards one Hinata Okano who was standing between Isogai and Maehara. She had short brown hair sitting just a little longer then Sugino's and light purple eyes -almost pink in colour- blinked at the yellow tentacle that was held towards her, she wore the female Kunugigaoka school uniform but unlike Nakamura or Kayano she didn't wear a blazer or jacket and instead only the white long sleeved shirt that tucked into her skirt, short black socks and white sneakers.

"Load the bullets and hand that over to me please." Okano hesitated, unsure if she should hand a loaded weapon to their target.

"Okano-san," purple eyes made their way to meet the only sky blue ones in the class, "If he wanted to he could take all our weapons without much trouble or notice, and well…" Nagisa looked at the teacher with worry in her eyes, if she was wrong, and he didn't want to follow that condition then, they're in trouble. Her voice became lower in volume, as she shifted slightly, "There's still the condition he needs to follow…"

Their teachers skin colour changed once again to the orange and red one effectively drawing all attention away from the second shortest in the class and to him, "That's correct, I'm aloud to bring no harm to any of my students." Okano gave a smile and loaded her air M1911 Handgun without second thought before placing it into the still extended tentacle.

"Now then… I told you: these maybe harmless to you…" He slowly took the gun from Okano's hand and lifted it to point at his other main tentacle.

He pulled the trigger.

Yellow goo blasted out in the opposite direction of the gun in a fashion that would have been crimson blood had it been a human are that was shot off. The class gasped in a calibration of shock, horror and sickness as they watched more of the yellow substance poor from both parts of the tentacle that twitched uncontrollably.

This was what a Special Arms Against Unidentified Slimy Octopus could do. That was what the small, pink BB did.

"…But they're anti-me BBs that are developed by the government. As you can see, if one hit's me it'll be as tough you where slicing butter with a hot knife." The part that was still attached to him stopped letting of the yellow goo, "Of course," he looked at his tentacle drawing the eyes that weren't looking at the one that still flopped on the floor "they regenerate in a few seconds."

"Still there is a chance that you could hit someone in the eye. No shooting in the classroom unless you're trying to kill me." His grin grew and his skin gained green strips. "I do hope that you can kill me… before graduation that is." His expression changed back to the way it was, "Now then, let's start cleaning up this room, class is starting."

It was lunch time, their octopus of a teacher had gone off to China for whatever reason to gain food and much like the morning, there was a gloom hanging over their heads.

"Nagisa-chan?" Kayano questioned looking at the bluenette who was tapping a pen on her water bottle, they had only known each other for a day and a bit, but it wasn't unlike the whole class didn't call her by first name and when questioned about it, she simply shrugged and said that she's always been called by first name and would highly not respond if someone called her by last name.

Still Kayano felt attached to her and had a feeling they would get along well given time.

Nagisa blinked out of whatever she was thinking, "Oh, ah Kayano-chan."

Green hair bounced in happiness, before the owner pulled her seat over to sit next to her, "What's on your mind?"

"…Just something that Sensei mentioned." Nagisa put her pen down and grabbed her lunch bun that was still in the packet, she continued to speak, knowing Kayano would ask, "He said that our line of sight, barrel position, the movement of our fingers give away what we are going to do." By this time, she's opened the plastic packet and Nakamura had joined the two.

The two girls hummed in agreement, "Yeah he did." The blonde said as she turned the seat that was at the desk in the front row around and sat in it.

"So does that mean our body language and expressions give away what we want to do more clearly? He managed to predict all of Karasuma-san's movement without much hassle at close range."

"Wouldn't that be because of how fast he moves he makes it seem as though he knows what and where something's going to happen?" The three girls turned to look at Sugino who had an eyebrow raised.

Nagisa took a small bite out of her bun and kept it at her mouth, eyes looking at her pen.

"…That's true…" Kayano agreed, her hand now holding her chin while the other held her elbow as she sat in thought.

"Just me thinking is all…" Nagisa spoke into her bun turning to look out the window. She –along with the other two- were taken by surprised when Kayano squealed and leaned over the desk to all but squeeze the slightly taller girl, one leg stretched out behind her, knocking her seat down with a thud.

"Kyaa! You're so cute Nagisa-chan!"

Neither Nakamura nor Sugino knew what to do as both still held their arms up from the fright of the sudden squeal. Eyes wide in shock. And of course the noise attracted everyone's attention away from their own discussions and to the group and the rapidly turning blue girl.

"Kayano-san! Nagisa-san can't breathe!" No one knew who spoke the words but all of them were grateful when the green head quickly pulled away and looked over the now once again breathing girl.

"Sorry!" Kayano apologised over and over, head bowed down. Only looking up again when Nagisa placed her hand on her shoulder and gave a smile, her bun on her desk forgotten.

"Kayano-chan its fine," Her arms feel to her side "I'll be outside if anyone needs me."

Nagisa looked up from her thoughts when she heard the sound of something coming towards her, Terasaka had came out earlier with his two buddies Muramatsu and Yoshida in hopes to get her to agree to help with the assassination they were planning, but the twin tailed girl didn't like where their plan was going. Using a suicide boomer, even that was going too far for the kill-him-at-any-cost. Or was it that she was afraid? Afraid of not even being able to do that? She couldn't think straight.

She put one hand down to hold her skirt down while the other flew over her face to cover her eyes as wind and dust picked up, the words 'I'm back' barely making it to her ears.

She flattened her skirt down once the air stopped moving. "H-hello Sensei…" She was unsure, her thoughts still jumbled up from the conversation beforehand. Nagisa blinked at the sight of what the yellow creature was holding "Ah… What's with the missile?"

"A souvenir." He sounded way to happy, "The Self-Defence Force was waiting for me in the Sea of Japan."

She felt sweat fall from her skin, "I-it must be terrible, being a target that is."

The teacher shifted the missile, one of his main ones and another holding onto it, "Not at all. You know you're powerful when everyone wants to kill you."

With those words something clicked inside Nagisa.

"Now, let's go and start the last lesion shall we?" The teacher walked past the blue haired student, his eyes catching four other forms just entering the building, one having light coloured hair, two having dark haired and the last having both.

"Yes Sensei." Nagisa said quietly, having yet to turn around, blue eyes now looked at the ground. 'He doesn't understand. If everyone is trying to assassinate you, that means they all acknowledge the power you hold. Someone like him would never understand what it's like being unworthy of anyone expectations or fear, even their recognition…' while her own words ran through her head images kept on playing in the back of her mind the most noticeable one was the one with her teacher of last year, the one she barely remembered other than the words he spoke.

Nagisa lifted her arm up and looked at the red ribbon, 'I might be able to kill him. After all… he also can't see me.'

No one knew how to respond to the task the teacher gave, write a poem with the last line being 'Was tentacles all along?'

A female student was the one who first said anything about it, the raven's hair fell straight without a problem, her light brown eyes weren't the only ones that held confusion in the class, she wore the female Kunugigaoka school uniform much like Kayano, the only difference was that she wore black, full length stockings.

"'Was tentacles all along'?" Yukiko Kanzaki asked to confirm.

"Indeed! Now when you finished, bring them to me. I'm looking for proper grammar and whether or not you show the tentacles true beauty." The yellow creature said before giving an example of what he was looking for.

Isogai sighed propping his arm up to hold his head "'Was tentacles all along'? Really?"

To make matters worse the teacher added another condition, that once they finished they could go home.

"How are we going to do that?" The female who sat to the right of Isogai complained, her wavy orange hair bouncing as her bright green eyes looked at their teacher in the best impression of a kicked puppy Hinano Kurahashi could muster up.

"My, my. Aren't your minds just coming up with slithery phrases?" He asked before he started to wiggle around a number of tentacles, "Slither, slither, slither, slither, slithe-!"

"Enough with the slithering!" Maehara called out in a hurry, almost stumbling over his words, and for a quick moment the yellow creature turned pink.

"Sensei, I have a question." Kayano spoke up from behind Maehara, her arm raised up.

"Ah, yes, Kayano-san?"

"This maybe weird to ask now, but… What is your name?" She continued to speak even after the odd sound their teacher made, "How else can we tell what teacher we're talking about?"

For once the teachers tentacles stopped moving, "My… name?" he repeated.

"Now that you mention it…" Sugino's blue eyes locked onto the back of the green haired girls head.

"…he never did tell us." The girl sitting to the left of Sugino finished what everyone was thinking. Her somewhat purple bob hair moved around when her purple eyes moved from Sugino's form to their teacher, her female Kunugigaoka school uniform matched that of Kayano and Kurahashi.

The teacher started to scratch his head "Hmm… you know, I don't really have the kind of name you tell people. Go ahead and give me one."

Maehara felt sweat form on his skin at that statement, and he wasn't alone. "You sure about that?"

"But right now you should focus on your schoolwork."

While many eyes fell to their desks and paper one set stayed up, watching the yellow being before they flickered over towards the only person with blue hair, recalling the words that she said about the teacher seeming slower than normal after lunch yesterday. The girl had a strange knack for looking out for details one wouldn't normally pay attention too unless something was said about it. Question is though, is she correct.

It wasn't long until the silence of the room was broken by tapping of a pen, not that anyone payed attention to it at first but once the only person in the class with two hair colours of brown and bleached blonde, reacted in a growl, his pale green eyes -almost yellow- glared at the back of the head of the female who was causing the sound. Ryouma Terasaka wore the male Kunugigaoka school uniform, but didn't wear anything over the top of his white shirt and left it untucked or had a tie around his neck.

The female he was glaring at stoped tapping her pen, only to start again a few moments later. She had short, untamed raven hair, her dark grey eyes that were framed by dark eyelashes held a hint of amusement, knowing that this was something that annoyed Terasaka. She, like the other females, wore the female Kunugigaoka school uniform without any changes to it. Kirara Hazama stopped taping once she heard the trouble maker start to growl again.

The dark eyed raven held a red covered book to her face to hide her smile from the reaction she got.

"Damn it Hazama-san, unlike you not everyone can finish a poem, much less one like this, within a few minutes!"

Their normal not pink teacher turned towards the back corner on the door side, "Finished already, Hazama-san?" The girl placed her book down with a sigh.

"Yeah, I love reading, so stuff like this is normal for me." The raven picked up her book with shaky hands and got up from her seat, drawing all eyes to her as she walked to the front. She swallowed as she passed her work book over and let her arms fall to her side.

The now once again yellow creature looked at her trying to make eye contact but couldn't as she kept her head towards the floorboards. So he gave up with that and looked at the poem, only for his ever moving tentacles to stop moving the second time that day, the dark words practically stabbing him each time he read one. He didn't look up as he started to speak instead his eyes stayed glued to the words that kept stabbing him and his sweat kept gathering.

"Nagisa-san, bring yours up."

The mentioned bluenette blinked, "E-err? I've only done a few lines…" She hesitantly got up when he twitched a tentacle in indications to do as he said, pausing momentary to hid her green knife between her book and herself after a quick thought progress. 'He's not on guard, before he also reacted slower then normal to Kayano-chan's question … and well if it doesn't hit him he'll think twice before asking someone to walk up there without their own reasons.'

She walked up without a problem, she was simply going to hand over her book, nothing more nothing less. She didn't pause when she stood by Hazama and instead of passing her own work book over she moved the blade that was behind it and made for their teachers face, her eyes changed in that motion to something very well hidden.

That something disappeared as quickly as it came, Nagisa knew she wouldn't hit, even if his reaction time was slower than normal he managed to catch her arm with room to spear.

The creature looked up from Hazama's workbook and looked at Nagisa's expected expression that was facing the floor. "I told you; think outside the box!" Another one of his tentacles moved to grab the green knife with a white squared cloth, taking note of something hitting the floor.

Sky blue eyes and dark grey ones widened at the sight of what hit the floor between them and their teacher, their owners had no time to react to the grenade that been thrown before it burst into a white light, sending a mound of pink BB pellets all over the classroom.

All the seated students were forced to hold their arms over their heads so no harm could happen to them. Only 3 out of the seated 23 students didn't care and instead gave out cries at the sight of crisped tentacles.

'Nagisa-chan! Hazama-san!' Kayano held her hands over her mouth, fear edged in her hazel eyes.

Everyone turned towards the tree males that had gotten up and where still celebrating. Oblivious to the amount of glares and disappointed looks they were given.

"Terasaka!" Isogai was the first to snap at the big guy, almost standing from his seat. His childhood friend following his lead.

"What have you done?!" Maehara called over the ones who also voice their disagreements.

The two coloured haired male and two followers ignored them and instead walked passed them.

"Ha! Bet he never expected an outside force taking the kill!" Terasaka looked down at his handy work with glee.

"Hey!"

Terasaka turned his head to look at the green haired female that called out, her seat knocked back and laid on the floor.

"Are you stupid?! What did you throw at Nagisa-chan and Hazama-san!?" She moved around her desk, why no one else had gotten up to check on the two females that they couldn't see was beyond her.

"Tch," the boy straightened "A toy grenade." He didn't let anyone have a chance to have an outburst, "Thing is though, I beefed it up with gunpowder and 300 BBs at a crazy high speed!" Once again he ignored the cries of the other students. "It's not strong enough to kill anybody and those two knew that I had it." He moved to the forms of the two females that had yet to move, some worry entering his pale green eyes, "Look I'll cover their medical bills, neither of them wanted to-"

The two girls laid on the floor, eyes closed, backs touching each other, but that wasn't what made Terasaka stop talking. It was the fact that the two held no injuries and that something like a plastic blanket covered the two. "They're not hurt? Not burn?" he questioned himself more than anything as he started to lift whatever was on them off, and followed it to the charred set of tentacles "And… what the hell is this?"

"…As it happens," Terasaka shot up, dropping whatever he had in his hand and felt sweat fall from his skin. He knew that voice, all of them did. Problem was though, none of them could find where it was coming from.

"I can shed my skin once a month. I used it to protect Hazama-san and Nagisa-sun." As he said that the two mentioned girls groaned as they sat up, eyesight fuzzy and hearing buzzing.

Everyone was able to locate where the voice was coming from, looking up, they were meet with the sight of their teachers eyes glowing red.

His eyes flashed, and let the feeling of despair flow into the three boys that stood at the front. "It's my once a month ace-in-the-hole." He paused. "Terasaka, Yoshida, Muramatsu."

No one's eyes could look away from their teacher. It was a well-known fact that his skin changed depending on his mood, but no one needed it to help them to tell how their teacher was feeling.

He was furious.

"You three… you're behind this yes?" In all honesty is was surprising that they hadn't bolted, or maybe they couldn't move, something a liken to frozen in fear had taken place.

They couldn't form a sentence as they looked directly into their teachers more noticeable black eyes. Everyone screamed when their teacher disappeared from the roof allowing the air to force down on them.

"H-He's gone!" Yoshida's observation was cut off as another blast of air hit the students making some of the girls let out yells of surprise. The air flow didn't die down but the three males heard the clanks of wood hitting wood, all of them turned slowly towards the now open door.

The creature stood there, holding a bag full of small wooden planks. In front of him laid three on the floor, each of the three boy's last name written on them.

"The nameplates off out houses?!" One of them questioned.

"My agreement with the government say that I won't harm you. But if you try another assassination like that one..." he dropped the ones gathered in the bag he held, making it clear he was talking to everyone. "…I might harm someone else." His normal block teeth looked more pointed then when his was hanging in the rafters, "Your family, your friends… or maybe I could wipe out the whole planet apart from you."

Nagisa's hands griped tighter around the hem of her skirt, 'There's no running for us, if we really want to run… all we can do… is kill him.'

She was brought out of her thoughts by Terasaka yelling, "Wha-What the hell's your deal anyway?!" he pointed at the monster that the students shared a class with. "What right do you have taking our normal lives away with your 'I'm gonna blow up the Earth' and 'Assassinate me' bullshit?! You saying we don't have the right to fight anyway cheap we want to?" his voiced wavered when their teacher's eyes flashed once again.

But everything changed after the words left the two hair coloured male. The classroom returned to how it was before, no heavy air hanging on all of them, no black skinned teacher. Instead his skin had returned to normal and his face orange with a big red ring.

"Cheap? Hardly. Your idea was a very good one." One of his main tentacles patted the still seated bluenette. "You may not have known what was truly going to happen, Nagisa-san, but the way you carried yourself when you went to stab me gets full marks. Had you been faster, than the knife may have gotten my tentacle when I blocked you. Hazama-san, you need to work on your approach, I had a feeling you knew something and was worried about it"

He returned his tentacle and pointed it at the three boys who somehow still managed to produces sweat. "However! You lot didn't look out for your classmates, and instead gotten two of them caught up in it. I don't mind that you used Nagisa's assassination attempt to block out yours, but disregarding the safety of your classmate aren't fit to assassinate anyone." His skin changed from yellow to purple with a darker purple cross.

He turned to face everyone in the class, his skin once again yellow, "We need an assassination that's worth to smile at, one to be proud of! You're all capable assassins who have that power within you." He held up a tentacle while the other wiggled around, "Some advice from your teacher and your target…"

While he talked, Nagisa stood up and held out a hand towards Hazama who smiled and took it, pulling herself up with some help before they both flattened out their clothing.

"Here's a question for you, Nagisa:" The twin tailed girl looked up at the yellow teacher. "I have no intention of being killed." He looked back over to the seated students. "I will enjoy my time with you all until next March, and then blow Earth up." He turned back to Nagisa intent on asking his question, "If you don't like it, what are you going to do about it?"

The blue eyed girl looked up more, surprised by the question, 'We've never assassinated anyone before, and there's other stuff we need and what to do.' She clenched her fist, 'But… I think sensei, might be another one that can accept my bloodlust.' She smiled, before tilting her head down slightly, letting her bangs shadow her eyes and looked right at him, 'So he can see me…'

"Simple, before you destroy Earth… I'll kill you."

Their teacher let out a laugh, his skin gaining green stripes. "Then do it!" He turned quickly, his face returning to yellow, "Once you've killed me, you're free to go home!"

No one was happy with that and all looked at their teacher, waiting for him to say 'I'm joking.' With that Nagisa and Hazama turned to return to their seats, the three boys having already done so.

"Just like that?!"

"You know we can't kill you!"

Before Nagisa sat down, their teacher had already started to clean up, fixing up the desk, sweeping up the 300 BBs and now cleaned a name plate.

"…Even if we shot him now…" Every student in the class had pulled out their air guns

"We'd just be polished like those name plates."

"We're never going home!"

Kayano looked up, a though having hit her, "An unkillable teacher…" Nagisa turned towards the green head, tilting her own in question, "'Korosensai'… 'Koro'… Oh!" She turned to look at Nagisa, "How about 'Korosensei'?"

"'Korosensei?" Nagisa repeated, gaining the attention of their teacher.

The class bell rang.

Chapter end.

Please leave a review and ask questions if you like, though I won't give anything on where this fic may go. Oh, and feel free to give title suggestions.

Till next time ninjapanda16 out!