A/N: WARNING! This is going to contain many OCs as the students of Paradise High. I will try to gently introduce every character! Also! This will posses slightly strong language! I hope you enjoy the first chapter!

For new readers, please skip he rest of this. For people who have already read this up to Nagisa-Sensei: The Fit, please make note that all of these chapters have been newly edited and are different! As of January 20th, 2018, I have mostly fixed mistakes that I initially made.

Nagisa-Sensei: New Sensei in Paradise High!

Isao Oshiro's POV

Paradise High School is the exact opposite of what people would assume it would be based on the name. The town is the one of the most criminally active areas in the region. It was ridiculous to call this high school "Paradise High School", but the adults here were just that ridiculously idiotic enough to name it that way. The principal doesn't even bother to try and help the students. He's all about getting the money to spend on women or whatever. Y'know the usual things old men with no wives or children do. Student here has some shitty sob story to them. I'm no exception, but no one bothers to spill their secrets here. Practically all of us were guys, we weren't pussies like those prissy kids from Class 3-1. Those piles of crap that I couldn't even bring to be concerned about were weaken and wimpy. They seriously believe that they could get a future starting here? And the teachers alway gave us these pitying fake smiles and tried to explain things like we were babies. We're not. That's what I hate about this damn school. Of course, I don't need to be complaining. After all...

I could've dropped out...

But I didn't. I blame myself for being weak.

After that bastard left Mom, she's been working all hours of the day just to scrape up money for college. She would always smile weakly and tell me all about how great the future will get for me. After years of her delusions of a better future, I ended up just staying in school to make her happy. It was finally my third year in this hellhole. I could finally get out of here and maybe - maybe go to college like Mom wanted. Or just go straight into the workforce.

Whatever. It doesn't matter now. What matters is the little shit standing in the front of the classroom. This very blue-haired lame-ass was standing nervously in the classroom. An unfamiliar, blue-haired shortie daring to stand in this room with us. Some "teacher trainee" that would be teaching the class. Bullshit. The teacher, Takahashi, didn't even bother to come into school most of the time. Probably because we scared the ever-loving shit out of him. We just had to place a good punch to the face and he was out of there! Why the hell did this shrimp even try to come?

The guys started to crowd around the small guy - or girl? Honestly, I couldn't muster up the feeling to care. I just wanted the blue-haired shrimp out of here, and we can go back to the normal daily shit storm. As the guys started to get into the trainee's space, the bell let out its warbled ring to try and start the school day.

The trainee's squeaky voice could be heard. "The - The bell has rung, so t-take y-your seats, class."

The idiot thought he could control us with that line? Seriously?

Takeo Sasaki sniggered. "T-Take your seats, class! Ha!"

Others let out a roar of laughter as I stood up and confronted the little twerp. I seized him by the tie and gave him a death glare.

"You don't get to boss around. We'll kill you."

The trainee looked at me with astonishment in his or her eyes. His look quickly turned into a blank stare.

"Kill?" he seemed to breath out.

Everyone stared that the shortie in confusion. This wasn't the usual reaction teachers gave us.

He looked down as an amused smiles began to slowly spread across his face. "Kill, huh?"

I'm not completely sure if that was meant to be heard or not, but I couldn't say a thing at that moment. No one has ever reacted this way to my threats. Why was he different? The trainee suddenly stretched out his arm and dropped the class attendance list. My attention immediately turned to the falling object when a sudden loud clap knocked me out of my focus. Before I knew it, the shortie was behind me, holding my head the other way and pressing a finger into my jugular.

What the hell?!

The others gaped in shock as he twisted my head tightly to the side. His grip loosened and he pushed me down onto a chair. The sound of the chair sliding across the floor was the only thing to pierce through the heavy atmosphere in the classroom. There was a period of silence as I stared at him with wonder. He was crazy, I swear.

A serene smile was on his face. Not one of fake cheeriness, but a genius, actually smile.

"I do hope you can kill me," the trainee spoke casually, "before graduation, that is."

I couldn't believe what I was hearing. I watched as he slowly went to pick up the class attendance list. The others backed away from the guy as he walked by them. The dim room was at a stand still as the other students began to access this new threat. It was like a there was a completely different person in the room. The weak small teacher-trainee. Now standing there was like some confident assassin waiting for the next target to talk down. He practically oozed confidence. As he stood be fore a sea of confusion and surprise, he looked at each and every person in the room with a sense of acknowledgment and respect.

With a newly found voice of boldness, he said. "Take your seats! Let's begin!"

I begin to feel as if this year would definitely not be a normal year with some normal teacher.

Could this be a good change? Or would it be bad? The hell if I knew, but the trainee was looking at the class attendance list as he began calling out names left and right with people struggling to find a voice. People were scattered around h room in various positions. All seemed to look as if the floor was about to open up and swallow them. As he finished his roll call, he looked up at everyone in the class. He seemed almost nostalgic at the sight of shock faces. It was like he knew what it was like in our shoes.

"It is a pleasure to meet all of you! My name is Nagisa Shiota! Please refer to me however you'd like! Preferably, Nagisa-sensei please!"

A/N: Thank you for reading! This is the introduction of my story. It originally was just to see if anyone held an interest in the journey of Nagisa as a teacher! I, on the one hand, had been and have been craving for a good fanfic about how Nagisa would be as a teacher, so I thought about attempting to do it! This is unbetaed, so I apologize for any mistakes! I have tried to keep it as canonically correct as possible! There's not much detail about Nagisa as a teacher, as of now, so I apologize for an incorrect information!

Edit (1/20/18): When I said there were a lot of mistake, I meant it. Before and now.