"Give'em Hell, lads!", a voice roared followed by a chorus of cheers and battle-cries. The large maintenance hall, once an empty space designed to house the many large components of the power plant, was now the killing field of the clash between the demons from Hell and the residents of the Underground. The residents, mostly consisting of survivors of the demons' onslaught on their homes, were rallied up and led by two oni many believed were part of the Three Devas, Suika Ibuki and Hoshiguma Yuugi. Most of them knew who they were and those did not have heard of them. Aside from their reputed strength, they were also famous for frequenting all the bars and pubs in the Underground—and wrecking some of them whenever they get into a drunken argument. While Yuugi's height and demeanour may be frightening and Suika's never-ending drunken stupor may be off-putting, the people of the Underground love them for their carefree attitude and genuine care for those she considers friends.

The attack on the Underground came as a surprise for all of them. One moment they were glued to their televisions and screens listening to the next momentous change that Former Hell Solutions might bring and then the next moment Parsee was killed and deformed live by the co-founder, an intense earthquake levelled most of the city and then monsters came flooding out into streets and massacred their friends and families.

To say that they were traumatised would be a huge understatement; the streets of Former Hell were overrun by these…monsters…neither human nor youkai, almost as soon as the earthquake subsided. No one knew what they were. Nobody could have foreseen the horrors they have experienced first-hand. The rivers of blood that formed from streams of slaughtered households, wives watching helplessly as their children get devoured, husbands breathing their last breath underneath the sole of a giant goat-demon, watching their families get annihilated. None were safe, they did not discriminate. It was the cruellest form of equality that all had to bear; everyone was equally in despair.

It was no wonder when one of the survivors saw Yuugi overwhelm entire swarms of the smaller imps with ease, the fire of vengeance has been lit. That fire grew bigger when Suika jumped into the fray by swinging around her ball and chain, crushing the bones of any demon within range. To the people who had sealed them off in the past, the Oni were horned demons. To them, they were their only hope of fighting them back.

"That's the spirit, people! Let's teach them a lesson!", Yuugi cried out with one of her muscular arms pumping in the air. Taking a dramatic step back to take up a fighting stance, she smirked as she charged her arm back, clenching it hard to reveal bulging veins. In the heat of moment, it almost appeared like her breathing gave off steam, giving her a menacing aura.

The army of demons, consisting mainly of the small fire-throwing imps, the bulky tusked creatures that charged through with no mercy and the imposingly tall goat-headed demons that had an energy cannon for a hand. Their numbers dwarfed those of the resistance and those goat demons (which they dubbed the Baron) easily stood over Yuugi by several heads. The imps hurled fireballs into the frontlines of the opposition, leaving holed bodies in their wake.

Doom appeared inevitable, their efforts futile as they were slowly overwhelmed by sheer numbers. All hope appeared lost until…

"Big Four Arcanum: [Ultimate Knockout in 3 Steps!]"

KTHOOM!

A huge shockwave ploughed through the whole mid-section of the demonic army, a cloud of dust and debris hissing from the aftermath. Soon, the air that has been displaced by the shockwave came back down as rain. The fist that created the shockwave hissed with steam as the rain fell, momentarily masking a glimmer of a sombre demon. The smirk then reappeared and with a triumphant laugh, Yuugi gloated, "That all you got, beasts! We got more where that came from, that's for sure!"

The men and women behind her found themselves in tears and their morale regained. And thus, they charged into the fray with their battle cries, armed with whatever they could find. Dropped firearms, pitchforks, their own magic; anything was fair game if you could kill with it. One even resorted to throwing plates at the demons for that was the only thing they could do.

However, emerging from behind the waves of demons, a mighty roar bellowed. Heavy thuds marked each footstep it took, the revving of its rotating rocket-launcher arm deafening the shrieks of frightened imps beneath its feet. The resistance advances halted in terror as they saw the terrifying monstrosity that loomed over all of them. It had a large head with a fittingly large set of horns that made it look like part of a helmet. It was about more than twice the size of the Barons and its body was plated with some ancient armour yet something about the core in its chest appeared to be futuristic.

"N-no… no way…!"

"This can't be! What is this?!"

"Honey, I'll be seeing you much sooner than I thought…"

Murmurs of fear and panic seeped into the ranks of the forefront of the resistance. What was this…thing…that even the demons were afraid of?! Why must such a thing exist?!

"Oi! Big guy!"

The massive demon, known in the Archives only as the Cyberdemon, snapped to turn towards the small blonde one-horned female flesh-bag. Beside it was a smaller, dual-horned female. It roared at this insignificant display of defiance.

"Yeah, that's right! You!", pointed Yuugi with a confident finger. "I don't know what y'all are or where y'all come from. I don't even know why you came here or how many of you are there. What I do know is this simple truth: Nobody comes into our peaceful city and cause trouble without any repercussion whatsoever!"

"T-That's right!", slurred Suika, her cheeks flushed red. "You're gonna come 'ere and we'll kick your asthbhphtl…"

"Goodness me, Suika, don't tell me you're this drunk already!", chided Yuugi with a grin.

With a grin to match hers, Suika replied, "Water you on about! I'm thober as ever!"

The behemoth roared loudly, its maw wide and toothy. It swiped its non-rocket launcher arm to launch several sharp energy slices towards the duo. In a flash, their eyes slanted in seriousness and they dashed towards it, kicking up a dust cloud.

The rest of the resistance force provided their undying support by having anyone with ranged weapons take shots at it while the two oni fight to take it down. Soon, the scene of the maintenance hall was that of a colourful chaos as the ground was painted with the blood and gore of both demon, youkai and human while the air above it was filled with reds, blues, oranges and whites as all sorts of projectiles were being exchanged. It was going to be a fight to the death. Both sides shall face heavy losses. But, if this was what it took to drive them back then-

"*taptaptap* Ahem, ahem, testing, testing… Is this thing on?", the intercom suddenly blared, grinding all conflict to a halt save for the oni and the Cyberdemon who happened to be taking their fight further away.

The imps grunted in confusion. The Barons turned wildly to look for the interrupter of their slaughter. The resistance forces, on the other hand, knew the voice very well.

"h-hey, isn't that-?"

"shut up! I'm trying to listen!"

"Ahem, attention all Underground dwellers and any residents of Gensokyo, please stand behind the yellow line. I repeat, please stand behind the yellow line and wait till the fast-moving locomotive has passed through. Thank you, and have a good day!"

As the announcement went on, all of the resistance members began to check the floor and lo, and behold! There was a yellow line that acted as a partition between the resistance and the demons. Not sure what to expect, the rest of the fighters who were stuck in the frontlines made a hasty retreat to get behind the yellow line with scorching balls of fire and energy hot on their tails.

Then, they watched in awe, confusion and shock as an array of four pairs of large gaps appeared on either side of the wall with the demons in between. Soon, the rumbling came. It was initially a small tremor, but it did not take long for the tremor to become quakes as speeding past those gaps were entire subway trains mowing down anything that stood in their way, a loud synchronised splatter and crunch resounded in the hall as the blood, bones and gore of the once-unstoppable demon army flew everywhere. After less than a minute had passed, the trains had disappeared, leaving the hall empty with nothing but stunned survivors and gallons of blood.

Making their presence known by emerging through the floor by way of gap were Yukari, Eirin and a tall menacing man in a suit of armour wielding a shotgun who were all in a defensive stance save for the gap youkai.

"W-what just happened?", a voice from the crowd of survivors called out.

Yukari simply smiled, opened her paper fan and cooled herself with it. "The cavalry happened."

The entire hall deadpanned. It did not make any bit of sense at all. One member, who had been holding himself back from mindlessly going into the frontlines to kill the demons to reunite with his deceased family, lunged towards her but was held back by the others.

"How could you?!", he screamed with teary eyes. "You mean to tell me that the efforts of all of us, our deaths and sacrifices, were all for nothing and you could have just wiped them all out like that?! Huh?!
WHY?! Why? Why…?"

He was then reduced to sobs as he felt his body go weak. Yukari, keeping her face hidden behind the paper fan replied, "I may be powerful in that regard, but I am no god. I am not omnipotent nor am I all-seeing, I have my limits too. Besides, those trains have to come from somewhere and I can't afford to keep using them or else it might cause others trouble!"

New York, 1998

Mass hysteria has been hitting the streets as news of the supposed haunted midnight train may as well be true as four subway trains have been reported by eyewitnesses as "covered in demonic blood". As unbelievable as it is, DNA reports of the blood have come out with no existing matches to any living organism on this planet, leaving many to speculate that it might have been true. Furthermore, the train operators have revealed in an interview that all of them, despite operating trains at various parts of the city at the time, have all reported the same thing: a trip straight into Hell complete with several types of demons.

In light of this, however, religious groups have claimed this was the sign that the Apocalypse is near. The more extreme of the groups, notable the Westboro Baptist Church, have begun picketing stating that the incident is proof that God has vindicated them.

One thing is for certain, no one theory can properly explain this weird, bizarre incident.

Yukari felt a cold shiver up her spine out of the blue, causing Eirin to raise a brow.

"Anyways, the real reason I've cleared this place out is because we're expecting the arrival of another person."

Before any of the resistance members could ask, she already started counting down.

"And 3…2…1…and…here she…"

The ceiling above them cracked and suddenly gave way to a hole, two figures seen tumbling down with a sickening crack as both their bodies bounced off due to the impact. However, despite the supposed fatal fall, they both sprung up to their feet.

"H-heh… you're pretty g-good…", panted the one with flowing long black hair and wore a tattered pink nurse outfit. She swiped the blood off her mouth with grit as she glared at the armoured figure staring her down then pointing weakly towards it with finger-guns.

The figure's armour appeared similar to that of the armoured man standing by Yukari and Eirin, but it was sleeker in design, had streaks of glowing orange energy across its body that complemented its ominous red visor and seven light-purple hard light blades floating close to its back.

"Likewise, pitiful Lunarian," it acknowledged with a feminine robotic voice. "But my quarrel is not with you but with the doctor that created the concoction that kept the one responsible for the deaths of my husband and son behind bars."

Eirin's blood ran cold. She knew full well who the armoured woman was and who she was referring to. The armoured man, on the other hand, betrayed no emotion behind his helmet and firmed his grip on his shotgun. Yukari simply smiled.

"Glad you could stop by, Your Highness. What brings you here to this neck of the woods?", asked Yukari in a sing-song manner.

Kaguya felt a vein bulge in her forehead as she turned towards the paper-fan loving youkai.

"Well, everything was going smoothly…"

Geyser Relief Operations Base, several moments earlier

She broke the arm off the Razer that dared to fire a laser through her twice before twisting it with a sickening crunch towards its own head and forcibly fired its attached laser-cannon. Kaguya had finally caught up with the demon that annoyed her to no end. She was pleased with herself for having the determination to do something for once but was then reminded that the area around the geyser was still littered with the bastards.

However, she then heard the searing sounds of energy waves being thrown around followed the dying shrieks of a chorus of imps. She turned around and her eyes bulged to see that most of the demons behind her had been sliced to pieces. The survivors of this onslaught were quickly picked off by the moon rabbit soldiers of the Yagokoro Defence Guard. She was then amazed to find that the surface had nearly clear of demonic presence.

Picking up a nearby sniper rifle, she put her years of FPS gaming into practice by attempting to headshot the remaining group of demons, which now consisted of scared imps as most of the heavy units like the Hell Barons and Hell Knights had either been slaughtered by the princess whose rage was eerily similar to His, gunned down by the relentless pressure put on by the defence forces guarding the Underground's wounded refugees or reduced to ribbons by this armoured newcomer who looked uncannily similar to Him. She aimed down the sights and tried to kill a limping imp. She steadied her breathing, letting the aim be on point and…never get the shot because the armoured newcomer sliced it by then.

She tried again on another running imp, this time attempting to hit it while jumping and spinning in the air. By the time her aim was on its head, it was already dead; head chopped off. This went on until there was only one imp left, the princess's patience wearing thin from having her kills denied with every imp. There would be no messing around. She took a deep breath, calling upon the spirit of AWP god, KennyS, to grant her the flick speed she needed to pull this off. Without second thought, she whipped out her sniper rifle and fired.

Wasting no time to confirm her kill, she flew towards the imp's location. To her anguish, she hit the shot…after it died being impaled by the same newcomer, its limp body still hanging by its killer's arm. Kaguya was having none of this. This guy may have saved her the trouble of clearing the floor, but she was not going to accept this travesty.

"Stop stealing my kills, you fucking hack!", she lashed out.

The newcomer said nothing but turned its head towards the angry gamer. "Hmm? "Stealing my kills"? It seems that the Lunar people have such little care for life that they treat it like a game."

Suddenly, the newcomer flung the imp's body off its arm and glowed a bright orange from the streaks of energy across the armour, seven bright lights coming into existence behind it. It then began to float and its visor flashed blood red as it stared down the Lunar princess.

"Was that the same way you people felt when you let her kill my family?!"

Kaguya had no time to react as a hard, electrifying punch connected to her face in a split second and she was sent flying. However, she managed to quickly recover by controlling her movement mid-air while floating. Her eyes narrowed in anger and in recognition of the person before her. On the Night of Demons, the Armoured Man left behind a scroll that was said to contain vital information about himself. She remembered reading the scroll centuries before her exile to Earth. While she had forgotten most of it, she did remember this:

"Rejoice. The Slayer he cometh.

And he is never one

For in his place there shall be another

To provide salvation

In the darkest hours of civilisation

When He is condemning the wrathful demons in another."

There was heated debate among the Lunar intellectuals over the meaning of this part of the scroll. They were conducted in the utmost secrecy as the scroll was now part of the Vault of Secrecy (it was a redundant effort now that she thought about it). Some argued that it meant that the Slayer was a god-like entity that was able to be everywhere at once. Some also argued that it meant that in the event of a demonic invasion, one person shall be chosen to take up the mantle as the Slayer of their civilisation. How this selection will take place was unknown, but they were certain it would happen. Seeing this armoured entity before her eyes, she could now say for certain that the latter was right.

Why?

Because the wearer of the Slayer-like armour was none other than the entity of pure fury and rage herself, Junko.

"So, being a fury wasn't enough for you?", joked Kaguya.

Junko snorted at this. "No. During the Night of Demons, I was initially going to use that as a distraction to sneak into the prison where she was held undetected. But, these demons were standing in my way for vengeance, so I slaughtered and mutilated every single one that dared delay my thirst for her blood. After leaving a sea of red in my wake, I was finally by the gates of the prison when suddenly an orb of blinding light appeared. It told me that my wrath and brutality were exceptional in dispatching the demons and so granted me a set of armour. I knew it was from an ancient being for it had a purity that matched my own. It called itself "The Seraphim" and told me that I was now the appointed harbinger of doom for the legions of Hell should they re-emerge once more."

Kaguya deadpanned. "Geez, woman. You could've just said yes and spare me the word vomit…Whoa!"

She sidestepped another punch to the face by moment's notice. "I think you have anger issues. Would like to book an appointment for counselling in my office?"

Kaguya then whipped out two revolvers out of nowhere and spun them around with flair. Junko, being the embodiment of rage, cared little for insignificant displays and went straight for the kill. Noticing a moment too late, Kaguya tried to shoot the fury in the head as Junko was already preparing a vicious elbow slam onto her head. However, the bullet hit Junko's elbow instead, knocking it slightly off course and causing the armoured fury to smash the ground.

The impact of Junko's elbow slam was so great that it immediately punched a hole into the ground, causing both fighters to fall. Taking this opportunity for an aerial assault, Kaguya and Junko rapidly exchanged punches as they fell, somehow forgetting they could fly altogether.

Which led them to their current predicament.

Yukari nodded, Eirin was flabbergasted and the armoured man was intrigued. Yukari, for acknowledging Kaguya's story and cheering in silence as she did not have to deal with the surface anymore, Eirin, knowing the tenacity the fury had with anything Chang'e-related and the Slayer curious of the intentions the Seraphim that bestowed upon the armour and strength that he became iconic for.

Suddenly, two gusts of wind blew past them as two horned women sped by. Everyone was confused, the resistance forces even more so. Hadn't these strong oni been fearless?

The loud roars from in front of them answered why.

The Cyberdemon had brought company. And company came in the form of a gigantic brain attached to a mechanical construct with eight robotic legs. A rotating laser-gatling gun and a rocket launcher on its underside and the tragic deformed body of the once-friendly feline pet of the Komeijis hung limply off the side of the brain like a tumour. The brain itself had an ugly face with glaring red eyes set for the armoured man.

"Slayer! Let's finish this!", it growled.

Yukari dropped all pretence of calm and scowled. So, Olivia finally decided to set foot into the battlefield. Whoever it was must have been real hasty in ordering her to do so. The Slayer said nothing but the quick switch to his BFG spoke volumes of his rage. Eirin, seeing what became of Orin, glared at the disgusting creature with tear-soaked eyes.

Not a word was said between them but the message was clear and Kaguya and Junko heard it very well.

Rip and tear. Until it was done.