Author's Note: Usual disclaimer's... 'do not own' etc.

So, writer's block has struck me and I've been neglecting my other projects. So I'm hoping to get the creative juices flowing with something new. Probably not my best idea, but let me know what you think.

To the people of the modern world, superhumans were a fact of life. Rare, perhaps, but undeniable. They were powerful beings, almost godlike in their strength. And they fell into conflict. A lot.

And, despite the best efforts of the so-called 'superheroes', it was also a much less happily accepted fact of life that the 'supervillains' would sometimes win the day.

Oh, they never won the world, as they would often wish. In fact, they never seemed to truly reach whatever goals they may have aspired too. The war was one they would always lose so long as the superheroes stood united against them. But, every now and then, they would win a battle.

And destruction would reign.

This destruction was often limited in its scope. They may have stood as gods among the mortal insects, but there was only so much a supervillain could do before someone who could dwarf even their power made it to the scene.

But, the more powerful the villain, the longer it was likely to take for such a being to arrive. Despite Batman's intelligence and skill, it was rarely a match when pitted against the strength to crush mountains in one's bare hands.

And the citizens lived safe in the knowledge that the most powerful superhumans rested on the side of the angels. But, at the back of their mind, they always wondered... what if?

What if some new supervillain came to the scene who was stronger than Superman? What would happen when the shield forged by the strength of the Justice League failed them?

It was something that had been the subject of many a heated debate. But it was also something that few people allowed themselves to truly believe possible.

So, when two-thirds of the moon were vaporized in an instant, the Earth's citizens did not question the story put forth by the world government. That a hostile alien force had attacked, only to be utterly annihilated by the Justice League. Unfortunately not without sacrifices, but such was the price of their survival.

The fact that there was no footage of this battle was knowledge relegated to the conspiracy theorists. The people as a whole did not question what they didn't want to know.

Because if the world's governments were all lying, then that meant that there was something out there that not even Superman could bring to justice. And the thought that such a thing was still out there, unchecked, could well send the world into anarchy.

Wally West was one such individual who had swallowed the truth without question. He knew the League. He trusted them and had fought by the side of the Flash himself for years now. The fact that they had lied to him before was something he happily ignored for weeks after the destruction of the moon.

Until Batman himself summoned him. The Dark Knight and the Flash combined forces for a good twenty minutes, in which time they completely and thoroughly shattered Wally's illusions and destroyed his understanding of the world as he knew it.

They were in the Batcave. That itself was a rare sign of the severity of the situation. Batman rarely entertained visitors. Even rarer were those he actually invited. The location alone, hidden away beneath Wayne Manor, meant that to be invited one must first be trusted with his very identity.

But what truly put Wally on edge was the fact that he'd been standing here in the Batman's lair a full twenty two seconds already and Dick had yet to appear.

And there was no way he couldn't have known. The Zeta-tubes announced his and Barry's arrival clear to Batman and Robin's personal communicators. Nobody entered their lair without their express permission and knowledge.

The fact that Dick hadn't already come down to greet him meant that he wasn't in the Mansion. Wally would know if he'd been kidnapped and he'd've already been informed if he were gathering intel on their assignment.

That meant that Bruce was keeping him out of the loop.

"Barry. Wally." Batman was seated at the wall-sized monitor. His cowl was down, exposing the face of a billionaire playboy holding an expression of severity that the public eye had never thought possible.

"Bruce." Flash's reply was just as curt. He was pulling his own cowl down and Wally, seeing this, followed suit. This was a meeting of people who trusted one another in a location that was perhaps one of the safest on the planet. There was no need for masks or names. It seemed there were to be no secrets held between these three. "I haven't told him yet."

Wally immediately grew genuinely concerned.

Bruce nodded gravely, standing slowly as he tapped at the keyboard with one hand, quickly calling up an image of the decimated moon.

"Wally," he said slowly. "Two weeks ago, two-thirds of the moon were vaporized."

"Right," Wally nodded uncertainly, put off by the severity of his environment. "By the Apokoliptians. What, are they coming back or something?"

"We wish," Barry sighed, bring a hand to his face to rub at the bridge of his nose. "No, it's something worse."

"We claimed the moon was decimated by the Apokoliptians during a failed invasion attempt," Bruce explained tersely. "As a last ditch effort to destabilise the Earth's climate and destroy life as we know it. We lied." He tapped the keyboard, bringing up a new image. "This is the creature responsible..."

The being on the screen didn't look real. It was as though someone had photoshopped a yellow smiley face on a giant octopus and thrown a robe over it's head. It's head was almost comically large and it's grin inhuman.

"We still don't know what the heck it is," Barry lamented. "It doesn't seem to even have a name. But it's smarter than anything we've ever seen and can fly at Mach 20. It's harder to hurt than Superman and can heal itself almost as fast as it takes damage anyway."

"We're still not certain how," Bruce continued. "But we are certain that it is responsible for the decimation of the moon."

Wally could only stand there, mouth agape, as two of the people he trusted most in the world flat out admitted that they'd lied to him. Lied to the world. And then...

"What happened to it?" He asked suddenly. "Did it escape? Is it loose again?"

Barry and Bruce shared an uneasy look.

"It's in Japan," Barry admitted reluctantly, not meeting his nephew's eyes. "And we never really... had it to begin with."

"No matter our efforts, we were unable to apprehend it when it first appeared," Bruce admitted with even greater reluctance. "Currently, it is free to roam the world at its whims. Despite everything we've tried, no one on Earth has been able to stop it."

"What!?"

"It gets worse," Barry sighed. "Whatever it did to the moon, it's claimed that it's gonna do the same thing to the Earth in less than a year now."

"We and the world governments elected not to inform the public so as to prevent unnecessary panic," Bruce explained. "Thus the cover."

"But..." Wally blinked fitfully as he tried to digest this new information. "But what's happening? We can't just let him blow up the world!"

"That is not our intention," Bruce sighed. "But our options at this time are... limited."

"How limited?"

"Look, Wally," Barry interjected. "You have to understand, Superman and the Green Lanterns have thrown literally everything they have at this thing, and he's still standing. We could barely even touch him."

"But there is a silver lining," Bruce revealed. "For whatever reason, the creature has bartered a deal with the world governments. If he is allowed to teach until the time he has chosen to destroy the world, he will allow his students unprecedented access to him. He will allow them the chance to study him and even attempt to kill him without fear of reprisal nor retaliation. He has sworn not to harm any students placed in his care and, so far at least, it seems as though he intends to keep its word."

"'So far'?" Wally gawked. "You're letting him teach? Teach kids? Are you nuts?!"

Bruce's expression did not change in the slightest.

"It's complicated."

Bruce and Barry tried to explain the situation to Wally. That the creature had taken the name 'Koro-Sensei', a play on the Japanese word 'Korosenai' meaning 'Unkillable', and had taken over a small classroom of Japanese students. How the students had been tasked with assassinating their new teacher by the end of the year by any means necessary. That a ten billion yen bounty had been placed on his head.

That, so far, 'Koro-Sensei' had only been truly threatened a single time.

"The students in the creature's care are capable," Bruce explained. "Some even show true and frightening potential in the field of assassination, brought to the surface by their desperation. But they will not succeed. The creature holds all the cards."

"The Japanese government is already working to get two new students transferred into his class," Barry added. "They're bringing in the ringers. Real assassins to do the job. An AI combat system and some kind of human weapon that we're still looking into. But the creature is expecting them, or at least something like them. They won't stand a chance."

"Which is why we need you."

"The Japanese government is being about as subtle as a brick with getting their assassins into that classroom," Barry elaborated. "He knows they're coming and he'll know what to expect when they make their move. But he won't expect you."

"If you agree to this mission, we intend to transfer you to Kunugigaoka Junior High School," Bruce told him plainly. "Your grades are more than impressive and will likely see you placed in one of the higher bracket classes. Once there, you will start to fail."

"Language difficulties, stress from the move, attitude problems," Barry listed them off on his fingers. "Whatever you want, really. You'll have free reign to do pretty much whatever. Annoy the staff and the other students."

"Sooner or later, they'll downgrade you to Class 3-E," Bruce confirmed. "And 'Koro-Sensei' won't suspect a thing."

"The thing is, Wally," Barry stated softly. "You and I might be the only two people fast enough to catch him off guard. Now, I can't get close to him. He can see me coming from fifty miles off and just take to the air. But you..."

There was a breath. A moment passed in silence.

"But I can?" Wally finished for his uncle. Under the guise of a student, 'Koro-Sensei' would have to let him get close.

"So..." Wally breathed deeply as this new information settled in his mind. "You want me to kill him?"

"You'll only have one chance," Bruce said simply. "He will underestimate you. Think you're an ordinary, untrained human like his students. Once he knows about your speed, he'll be on guard. We can't contain him and we can't afford to let him live."

"I know it's a lot to ask of you, Wally," Barry placed a hand on his shoulder with care. Wally leaned into the pressure without thought. "But this... this assassination needs to be done."

"The world depends on it," Bruce stated simply. "And you are quite possibly the only man on Earth capable of pulling it off."

Barry nodded, agreeing with Bruce's evaluation.

Wally shuddered. "I guess... I guess I'm going to Japan."

Class 3-'E for End' of Kunugigaoka Junior High School was known by several different names. None of them pleasant. It was considered by the faculty of school to be the drop off point for the school's excess baggage. A dumping ground for the students who couldn't keep up with the school's expectations. The last chance before expulsion.

It was a place to isolate them, so that their incompetence and slothful ways would not infect the other, better students.

To the students of Class 3-E themselves, however, it had another name. 'Ansatsu Kyoushitsu'. The Assassination Classroom. And it was a name well earned.

The students trained daily in the art of assassination, with their teacher as their intended target. Each failed attempt to kill the creature another lesson to be learned from so that one of them might make a successful assault before the year's end.

The students were ready disciples of these arts. More so even than their more traditional curriculum. But one could not deny the results.

Since undertaking this somewhat unusual curriculum, the class's grades had steadily risen across the board. Perhaps the students were able to apply the lessons learned in their training as assassins to their schooling, or perhaps it was their new teacher's superhuman efforts to see them succeed. It was difficult to say.

Shiota Nagisa considered their growing success to be a strange combination of both.

Their training in assassinations gave them strength of body and clarity of mind, whilst Koro-Sensei continued to push and prod and force them to grow.

It was under this training that Nagisa himself had come to cultivate and hone an uncanny awareness of his surroundings. Initially developed to keep track of Koro-Sensei and his incredible speed and wandering tentacles, it quickly grew to aid him in analyzing human beings and test questions alike for their potential threats and hidden motives.

It was a skill that he had come to rely upon and, with the news of a new student entering their midsts, it was a skill that he was currently putting to use.

Ritsu had already compiled a report on the student upon her various classmates' requests. Everyone wanted to know what kind of new assassin would be joining them, if only to be sure that they could stay out of the line of fire when he inevitably made his first assault.

His name was West Wallace. An American transfer student, his family had moved to Japan due to his father being offered a more prestigious position in the area.

During the initial entrance exams for a mid-semester transfer, West was assigned to Class 3-A. But, within weeks, his grades began to drop due to his difficulty with the local language and behavioral problems began to emerge due to stress. After a month, he had been dropped all the way down to Class 3-D. And now, it seemed, he had crossed the final line and the school was officially washing their hands of him.

He had been demoted to E-Class.

"He's... normal," Nagisa blinked, dumbfounded as he read the report. Many of his classmates shared his feelings. After Ritsu and Itona, well, they were expecting another professional.

"It's actually kind of a let down," Sugino muttered. "I was looking forward to seeing what new weapon the government could pull out to top Itona. West is..."

They'd seen him here and there around the school. Lanky build, red hair, genius IQ and a big mouth. There were some speculations that he and Karma were related.

"Still," Terasaka interjected with a chuckle. "I wonder what a newbie's gonna think about all this."

And that was the spark to quite the conversation. The only 'normal' student to join Class 3-E since Korosensei's arrival was Karma, who had taken to the situation like a fish to water.

How was West likely to take it when he learned that it was now his duty tot try and kill his teacher?

It was Nakamura who first offered an answer. Slamming her palm down on her desk, she hollered. "¥100 says he'll scream the first time he sees Koro-Sensei!"

"No way," Hazama scoffed from the back of the class. "He's from America isn't he? They've got all kinds of superfreaks over there. I bet he doesn't even blink."

"Wait, he's American?" Fuwa perked. "My money says he shoots Koro-Sensei on sight!"

And thus was the beginnings of the greatest betting pool Class 3-E had seen in weeks.

It had taken two months of preparation, but here Wally stood. Walking the poorly maintained path to E-Class's isolated schoolhouse, he knew that his mission was just beginning, but at the same time nearing its end.

After agreeing to the plan in the first place, it had taken Bruce weeks to square things with his parents. They didn't know about the mission. The League couldn't risk that information somehow getting leaked and making its way to Koro-Sensei, so it was on a strictly need to know basis.

Not even Robin knew. That's how far Bruce was taking it. Hell, Wally wondered if Alfred even knew of his charge's latest plan.

Rudolph and Mary West were out of the loop. As far as they were aware, Rudolph had been offered and accepted a lucrative new position at one of his company's oversea offices. It was a bit of a hassle to move, especially with Wally halfway through a semester... but the opportunity was too good.

They didn't know that Bruce Wayne had, through a number of shell corporations, quietly taken a controlling interest in Rudolph's company and had exerted his influence.

They weren't sure why Wally had insisted on Kunugigaoka Junior High School. The private institution hadn't really seemed to be their son's speed, as it were. But with the money from Rudolph's new position, it was well within their price range. And if their son was so enthusiastic about his studies? Well, then that was just another opportunity to be taken advantage of.

As far as Rudolph and Mary were concerned, their stream of good fortune began to run dry not long after that.

They knew Wally was a genius. They'd seen him in action enough times to know that there was precious little he couldn't do when he put his mind to it. They knew that he'd mastered Japanese and a half a dozen other languages on a whim more than a year ago.

They didn't know why his grades started to drop.

At first they'd thought it was simply the move. He hadn't adjusted quickly to the new environment and his language skills maybe weren't quite as good as they'd thought. But they continued to fall, little by little, until he was barely scraping by with passing grades.

That was when things turned heated in the West household.

They were paying for their genius son to go to a private educational institution, one of the best in the country... and he was wasting it? By what? Fooling around? Ditching classes? They knew that his lifestyle as Kid Flash had always had some impact, but this was far more drastic than it had ever been before.

And it continued. For almost a month. Until the school regretted to inform them that Wally was being dropped to their lowest class and could very well fail to qualify for a higher education if things didn't turn around quick.

They'd already talked to Barry and made it known that he was not to be running about as Kid Flash unless his grades improved or it was an honest-to-God end-of-the-world all-hands-on-deck scale emergency.

Things had been tense. But, Wally knew, it would all clear up soon. Once this 'Koro-Sensei' was dead, the curtains could be pulled back. His parents would understand why he'd done what he'd done and things could get back to normal...

Things with Dick had been tense too. Dick knew Wally, sometimes better than he knew himself. He knew from the moment they met up after Wally's first briefing with Bruce that something was up. He may not have known what, but he knew his best friend was keeping something from him. And that was enough to put a strain on their friendship.

And then, after he'd moved to Japan? After Kid Flash had been grounded?

Wally felt like he hadn't talked to his best friend in months.

He steeled himself as he approached the ramshackle campus that served as Koro-Sensei's classroom. He'd already been briefed by Batman, and the Japanese Ministry of Defense had seen fit to give him another in preparation for his meeting with Koro-Sensei. Which was just as well, he supposed. They didn't know who he really was.

They'd armed him with a knife made from a rubber-like material that was like to the creature teacher as Kryptonite was to Superman. He wore it on his belt, the sheath peeking out from beneath the blue blazer of his uniform.

The pellet gun designed to fire off rounds of the same material was similarly hidden. Both were easily identifiable to the trained eye, and the bulges would be suspicious even to the layman.

He wondered idly how the Ministry of Defense was able to handle this all so calmly. Sending 15 year olds in to kill the monster that was trying to destroy the world.

At least the League had trained him before putting him into a situation like this. He'd already had superspeed and Barry had had him in training for six months before Kid Flash had ever hit the streets.

Even now, while Bruce and his parents had been arranging their move, Wally had spent a month learning how to use a combat knife from Alfred. Why Wally was learning these maneuvers was something the butler had failed to question and how exactly he knew them was something he failed to offer.

He shook his head clear of these distracting thoughts as he came upon the classroom door. He'd need his full focus if he was to survive and succeed in this mission.

Breathing deeply through his nose, Wally forced himself to calm down as he slipped into his game face.

It was time.