Disclaimer: I do not own My Hero Academia or Fate/Stay Night

...

Bakugo bounced off the ground before rolling back to his feet before his momentum had even come to a stop. Raising his guard, he was able to block the high paced kick that Iida had sent in his direction. With swift timing, he managed to grab hold of the limb before Iida could retract.

An aggressive roar escaped his lips as he turned on the spot, dragging Iida with him and hurling him towards Ochako who had been trying to charge up on him from behind. Instead of taking any damage, Ochako sprung upwards and over her teammate. Whilst in midair she adjusted herself, doing a full rotation as she tried to drive the base of her heel into Bakugo's cranium.

The explosion quirk user managed to shuffle to the side and avoid the oncoming strike before lashing out with a kick of his own, catching Ochako in the sides and knocking her to the ground.

"And that's time," announced Aoyama, signalling an end to the scuffle.

Bakugo allowed himself to release a breath that he had been holding as he considered just what it was he had gone through. Two on one was nowhere near as bad as the seven on one he had endured only a few nights prior. Still though, handicapping himself to not use his quirk during any part of the exercise had made it mildly more challenging.

He had spent a lot of time thinking over the past few days, especially when he had been getting interrogated by the police. Even though he had managed to succeed on his own where so many others would have faltered, he had been reprimanded for his actions and for having potentially used lethal force against one of the villains.

That, that had been something he had struggled to comprehend. The odds were against him, heavily against him and he had actively tried to take a known villain out of commission. Yet it had been deemed as excessive force because it had the potential to be life threatening.

What the actual fuck were they trying to teach him? That even if his life was seriously in danger that he still had to hold back in case those actively trying to kill him were too weak?

This had in part made him suggest the exercises that they were currently going through, limiting the quirk usage in a disadvantaged situation. It's not to say that quirks were prohibited during the exercise, it was just to try and get them to think of alternate ways to take out the enemy.

Frankly he also wanted to watch the hot and cold bastard get his face punched in multiple times before resorting to his quirk.

Before the next bout could begin, the doors to the gymnasium swing wide drawing all attention towards it. Bakugo found himself pondering why so many members of the staff were currently making their way inside. That was until he saw just who they were escorting.

It seemed the sword bastard had made his way back and he'd brought his general studies girl with him. If she'd come back into the mix then it meant that something was going down. You don't simply walk out of U.A and then decide to waltz back in whenever you felt like it. Regardless though, he felt that things were about to get very interesting.

...

"Would you like us to remove your peers?" Nezu asked Shirou whilst perched atop Aizawa's head. Surrounding them were the rest of the faculty, every teacher that had been recruited in order to...well...that was yet to be seen.

"That will be up to them," said Shirou, only to receive a sharp elbow from Rin. "Yes?"

"This information is sensitive enough already and you want to show it to teenagers," she growled through gritted teeth.

"Like I said, it will be up to them," repeated Shirou, remaining steadfast in his decision.

"Well if this comes back to bite us on the ass you're the one taking the fall," said Rin, crossing her arms over her chest in frustration.

Shirou meanwhile knew better and the capabilities Rin had at her disposal. If things went terribly, terribly wrong with what was about to go down, she was more than capable of altering the minds of anybody who had been too heavily affected. Still though, whilst teenagers they were still teenagers that he had trained. She should have a little more faith in him.

"Alright guys, before you ask anything I need to tell you something," announced Shirou to the class of 1-A (it seemed those of 1-B had chosen either not to join 1-A or had decided to hold their sessions somewhere else) as he stepped in front of the hero escort. "I have something to reveal to the staff, something which many of them may find shocking, disturbing and will haunt their nightmares for years to come. If you wish to witness what I have to show them, you are welcome to stay."

"What's it about?" asked Midoriya as the rest of 1-A watched on cautiously. After having suffered under Shirou's instruction for as long as they had, hearing that he had something potentially traumatizing to show them was more than a little daunting.

"My past, my present and why I can no longer be the hero I wish to be."

Shirou's words rang out causing several sets of eyes to go wide, including those of the staff who had been unaware of that little bit of information. Before they could begin to question him, Shirou raised a hand and silenced any potential spokesperson. "The reasons will become clear shortly," he said. "Whether you wish to remain to see said reasons is up to you but this is your one warning because once we begin, you will not be able to leave."

The students all shared nervous looks amongst one another before standing firm, resolute in the decision they had come to. "Alright everyone, gather round," said Rin, stepping forward and beginning to orchestrate the event. "Rule number one, whatever happens don't disturb me."

Apparently that was the only rule she had as she placed a hand on Shirou's shoulder. She began to chant something which none in attendance could understand before the floor beneath her began to glow. Any hesitation that anybody in attendance may have had swiftly became null and void as the white circle grew at an exponential rate, surrounding everyone within a matter of moments.

It was then that the students and staff found themselves in an unfamiliar situation. The world around them had changed and despite it being the middle of the afternoon the sky was dark with night encompassing them. "We are currently inside me memories," said Shirou, drawing attention to himself and away from the world they found themselves in. "What you see, what you feel all happened quite some time ago."

The clang of metal on metal drew the attention back to the world around them where two men were currently in combat. While one may have focused on their attire or what they looked like, the focus was entirely on both the way they fought and the weapons they wielded. Weapons that they had seen in the hands of Shirou.

"This was my first encounter with heroes," said Shirou, reminiscing somewhat. "The two before you were selected to fight as champions in a hidden tournament, as were five others. While there were some rules, the most steadfast was this: the hidden tournament is to remain hidden."

There was a sudden sound from nearby, alerting the warriors that their battle was being watched. Before anybody could realize what was happening, the scene around them shifted and moulded to become that of a hallway, the walls around them glistening with moonlight. In front of them stood Shirou, panting for breath with sweat dripping from his brow. "You may think that in order to remain hidden, the participants might have threatened or bribed me to keep quiet," he said as the younger version of him turned around. It was only a split second later as the tip of Lancer's bright red spear pierced through his heart, eliciting gasps of shock and horror from all around him. "That was not the case."

"My god," he heard one of the faculty members say as the world around them shifted once more.

"I'd like to say that had been my first brush with death," said Shirou, ignoring the looks sent his way. Quite a few of the staff knew that such a strike should have been lethal and the fact that he was standing there at all must have only been to some sort of outside interference but since he had likely been dying, if not dead within seconds, it was hard to tell. These were his memories after all and nobody really recalled what was happening when they were unconscious.

The world had swapped to that of a street, illuminated by a couple of lampposts that hung above them. "After I had been attacked, through certain circumstances I found myself a participant in the tournament with my own champion, Saber," stated Shirou.

In front of them stood Saber, invisible sword in hand as she stared down her opponent. Said opponent was a behemoth of a man standing far taller than any normal man should. His body looked as if it had been chiseled out of marble with incredibly defined muscles covering the entirety of his body.

Before anybody could properly react, the brute of a man lunged high into the air, intent on destroy the target before him. Before he could properly descend however, dozens of projectiles struck him from the side. Even as he landed, tearing up the ground as he did, the man swung his weapon and knocked another two attacks to the side before a third hit him square, creating an explosion that sent debris scattering around the area.

"That right there is Berserker," said Shirou. "In terms of raw physical strength, very few had the possibility of even standing up to him let alone beating him."

"Saber, Berserker," said Nezu from atop Aizawa. "Was there a particular reason that these names were chosen?"

"The titles given to them represented the class upon which they were appointed," explained Shirou. "They were very protective of their real names as knowing it could give far too much information away for an enemy to properly strategize against. Even during the entirety of this tournament, there was a single enemy whom we were never able to identify."

"Because they kept the secret too well guarded?" asked Midnight, hoping that that was the right answer.

"No, because before we had a chance to discover it they were killed."

It was that final word which struck a chord with everybody there. Their opponent hadn't been defeated and consequently withdrawn from the contest, the result had been far more permanent. They had been slain on the battlefield.

As they were processing that, the world around them shifted once more but the setting didn't change. In front of them, Saber and Berserker stared down one another amongst a graveyard. It was Saber who struck first, charging forward. She drove her invisible blade forward in an attempt at piercing Berseker's flesh. The monster before her placed his hand in front of the blow, the tip of her sword piercing through the palm of his hand.

It was then that a beam of pure light burst forward, piercing clean through Berserker and tearing half his body asunder. At the gruesome scene, one of the watchers successfully lost their stomach, expelling bile and vomit onto the ground. Shirou merely ignored it. "This was the level of fighting we were subject to," said Shirou as the image of Saber stepped back. "Anything less than everything could very well end up killing you. Even thinking that your opponent was dead could prove to be fatal."

"No..." said Ectoplasm and Snipe simultaneously, focusing on the defeated enemy intently. It was with shock that sheer power began to burst forth in waves as the light in Berserker's eyes flickered back into existence. His torso began to stitch itself together piece by piece, flesh intertwining itself until he became whole once more. During this time the Shirou from the past had grabbed hold of Saber's hand and started sprinting away.

"It is only crucial in times of battle that one makes use of any advantage they get," said Shirou before what looked like a shooting star flashed into view and in less than the bat of an eye it collided with Berserker. The violent explosion that rocked forth put anything that Bakugo was capable of to shame, uprooting nearby trees and sending debris flying in all directions. Many of the people baring witness instinctively tried to defend themselves despite the fact everything going on in front of them was nothing more than a past image.

Eventually the blast settled down and in front of them stood Berserker amongst the destruction and fire, unharmed from what would have been a lethal blast to anybody else. "No way," said multiple students, unable to comprehend what it was they had just witnessed.

"Anything and everything could be considered fair game," said Shirou as the world shifted once more, this time sending those watching into a school room. While the day was bright outside the room was anything but. There was a purple haze in the air and all of the students were on the ground, clasping to whatever shred of life they could.

Yaoyorozu raised her hand to her lips as she saw those her age lying motionless on the ground and she was not the only one. "You have to be lying!" declared Midnight, moving to stand in front of Shirou and pointing an accusing finger at him. "Even the most heinous of criminals rarely target children."

"This act was done under the instruction of one of the students," said Shirou, causing Midnight's eyes to widen. "They did this under the pretense it could defeat one of their opponents. They had no care for how many innocent people they hurt in the process. They were determined to kill each and every person in the school just to kill either myself or Rin."

"You stopped them though, right?" asked Midoriya, speaking up.

"We didn't but another person did, beating Rider to death with nothing but his fists," stated Shirou as the world shifted once more, this time placing all of them into a mansion. The lot of them stood on a balcony as they looked down on the ground floor where Berserker was currently at the end of his current battle. His roar of anger pierced through the air as he struggled against the chains holding him in place, allowing him only the smallest of movements. "Let this be a lesson though, that no matter how powerful you are there are always those capable of ending your life."

As Shirou's final word pierced the air, Berserker's life was taken from the golden haired man in a suit standing before him. "No, Berserker," cried the young child next to the corpse.

It was with calm demeanour that the golden haired man walked forward, a thin sword in his hand. As the white haired girl turned to face him he slashed out, cutting through her eyes in a mere moment.

If those watching thought that that particular scene was gruesome, it was nothing compared to the act that followed seconds later as the man plunged his hand straight into the girl's chest, ripping out her still beating heart. Once more, there was the sound of somebody expelling the contents of their stomach and more than one scream of shock from those in attendance.

The world around them rippled once more until they found themselves standing in the gymnasium once more, Rin removing her hand from Shirou's shoulder. "As much as you probably wish that what you had just seen was nothing but a lie on our behalf, you are deluding yourself," said Rin as she brushed down her clothes. "What you just saw was merely a snippet of the battles we went through during that period."

"So why do the battles of the past prevent you from fulfilling your wish to be a hero?" asked Aizawa.

"Because, unfortunately, it seems that us being here is pissing off some powerful being," said Rin as she crossed her arms over her chest.

"Both of us have recently encountered a combatant from then, despite the fact that there should have been no way of them being here," said Shirou. "When Rin defeated her foe, the person before her shifted and changed, revealing themselves to be somebody else completely. We theorize that the enemies of our past are possessing civilian bystanders and taking over their body. Their sole objective it seems is to kill us and us using our powers is capable of making them detect our presence."

"This is all hypothetical," added Rin. "We're just using the information we have gathered thus far to craft a theory."

"Hence, there are only a couple of places where we are capable of using our powers without alerting anything of our presence."

"How so?" asked Nezu, fascinated.

"When finding a new place of residence, we craft a barrier around it which prevents our powers from being detected," explained Shirou. "It had meant to hide our presence from something else but it seems that it works in this way. Had it not, it was very possible that Berserker may have appeared during the Sports Festival and killed hundreds in an attempt to get at me."

"So you have a barrier that hides your powers from those who can feel it...around the entire school," said Aizawa.

"Yeah," said Shirou casually.

"It had taken us a great deal of time given the size of this academy," said Rin.

Nobody doubted her statement.

"How did you manage to do that without being detected?" asked Snipe.

"It was child's play," said Rin, waving it off. While it hadn't really given the teacher an answer he realized that he was unlikely to get any more information. "Point of the matter though is that Shirou can only use his powers in here without bringing forth an enemy so powerful they could eradicate anybody in their way."

"What about yourself?" Ectoplasm asked of the magus.

"I've safely secured a location where I am able to do as I wish without bringing trouble to me," said Rin. "You need not worry about me."

Her tone of voice told them that even if they tried to assist her in any way she would make them regret it. "So what will you do now?" Nezu asked Shirou.

"I'm not sure really," said Shirou with a shrug of his shoulders. "For as long as I can remember all I wanted to do was save people. Now however if I try to do that I may very well put more people in danger."

"What a load of shit!"

The group of students seemed to part, allowing Bakugo to exit the group and march straight towards Shirou. When he grasped Shirou's shirtfront, many of the faculty and students braced themselves for something to go very awry. "You say all you've ever wanted to do is help people, then freaking help people."

"Ka-chan," said Midoriya softly from nearby.

"You are the strongest person here," growled Bakugo through gritted teeth. Those who had formed any sort of connection with the boy knew how hard it likely was for him to openly admit such a thing. "If you can't go out there to save people, train me to save them in your place. Or if you feel that's too difficult, go open a damn soup kitchen and feed the homeless and help people that way!"

While the students eagerly awaited to hear how Shirou would respond, the staff took something very differently from that. While it had been well known that the students had been receiving lessons from Shirou in the art of combat, it sounded very much like Bakugo had just decreed that he would prefer his tutelage over any of the staff. Was it because he was their peer? Was it because he was the same age as them? Or, and here was a terrifying thought, was it because Shirou was willing to teach them something very different from what the staff did. Something that was very borderline criminal.

They had all just witnessed what he had lived through at a far younger age then what many of the heroes in attendance had suffered through their careers. It wasn't to say any of them hadn't suffered losses or defeat but in comparison it seemed petite. It also seemed that at no stage did Shirou receive any sort of counselling or support outside of Rin during this bloody and brutal tournament. Two teenagers, brought together by the battlefield and who could only rely on one another.

It sounded like something straight out of a manga.

"So what'll it be you shithead!" growled Bakugo, tightening his grip. "You said it yourself that you're free to use your quirk in the school. So you're more than capable of kicking my ass right here right now. So do it! Knock me down, watch me get back up again before you beat the ever living shit out of me over and over and witness how much stronger I get at your hands. If you can't save anyone, then I'll do it!"

"You'll do it huh," repeated Shirou, looking Bakugo square in the eyes.

From his position, Bakugo could see some semblance of life that hadn't been there moments before flickering in Shirou's eyes. "Of course you sword bastard!"

Rin meanwhile allowed herself to release a sigh. It was clear where this was going but it would only be a temporary solution. This world was one where villains did acts of injustice on the daily. Were Shirou to be in that place at that time, there was no chance that he would simply let such a thing be. They had spent decades with each other and knew each other like the back of their hand. In the heat of the moment, Shirou would act. He knew no other way.

She simply had to hope that when he did he didn't go all out and summon forth a Servant in the middle of a crowded street.

There was no telling how many lives would be lost.

...

Hope you enjoyed.

Happy holidays and all that. See you all in the New Year.