Author Notes:

If any of the readers are wondering, this specific story has no connection whatsoever to my other multi-cross project. This is basically its own story, focusing only on Marvel, DC, and ToAru, just these three, only a three-way crossover, so don't expect any other franchise to show up. If anyone has any questions, one could PM me.

Chapter 1

Insert Song: Start

Captian America Sound Track: 01 Captain America (Main Titles)

...He woke up.

Was that a good thing or a bad thing?

He could not really answer that, because he was still trying to find an answer. His black irises looked closely at his right hand - and would try to squeeze it a little. It was a little surreal for him. Then again, should he really be surprised at this point, after everything that he had experienced in his lifetime? Or lifetimes, plural?

If he were to look into the mirror, he would see himself, as a young man with black hair that resembles something from an anime called Dragon Ball. The young man could never be any more different than him. Or rather, this young man is him. A little black spiky hair, blackish irises, wearing a hospital gown. He wasn't handsome or ugly by any means, just average, resting in a hospital bed, with his head and face wrapped in bandages.

He breathes a heavy sigh.

He did not know what to think about this.

He knew instinctively where he was at this point. From what he gathered, this was after he had managed to save a young girl from the lost of yet another year's worth of memories... ...and that cost him his very own. Or it should have been. Something had happened when the feather had dropped upon his head. It made him remember.

To him, this felt like some kind of combination between the concept of isekai and something believed in by the Eastern religions which was called reincarnation. He had a past life. Well, two of them. This was his third life. As Touma Kamijou. The Imagine Breaker. The One who Purifies God and Slays Demons. He was... ...living the life of a fictional character, something he had seen in his second life. He remembered being introduced to that fictional character - Touma Kamijou - through an anime called A Certain Magical Index, the first season at least, airing from October 4, 2008 up to October 8, 2010.

He wasn't surprised at this point. The idea of living the life of a fictional character from a fictional universe. He had seen more bizarre universes in his first life, and he even survived through them. He was no stranger to strange things. But... ...it does leave him with a little pickle.

He was Touma Kamijou, but he was also someone else, two other people. Out of all of his lives, it's the second life where he had the most normal. It was where he had learned that the adventures that he had in his first life where recorded, at times inaccurately though that would be rather expected, as fiction. The same principle of fiction applies as well to his third life.

How did this happen? How was this even happening? Who was doing this? Who was keeping him trapped to live yet another life? What was keeping him looping into another life?

There were so many questions that filled his mind.

Knock.

There was a knock on the door. It made the young man very attentive. He slowly looked at the door. He knew who it was.

"Come in," he said, speaking with an encouraging tone, clear, but not too loud.

And the door would eventually open just a little. It revealed a nun in white, young and pure, with golden embroidery, and emerald eyes, though he noted that there was a little hesitance. He would recognize this face, and if he guessed correctly, the frog-faced medical doctor had just recently told him about his current condition - memory destruction.

Though, it did nothing of the sort this time, at least in part. It gave the young man memories of his two past lives. Well, there were holes in his second life that he could not recall, but memories of his first life were as clear as day. It seemed like a symbolic symmetry. His first life's memories represented the day. His second life's memories represented the afternoon sunset that had the moon and stars slowly appearing. His third life's memories represented the darkness of the night, to the point where one could not see the moon and the stars anymore.

A bit poetic to describe his memory situation.

The young man would smile at the nun. "Yes?" he would ask.

The nun hesitated to enter for a while. The young man did not mind. He could wait. He knew just how delicate this situation was. He had seen it play out in the Season 1 anime that he watched, but he also read the light novel version of the scene. Yes, he read the actual source material. He had a very clear memory of all of the Old and New Testament light novels. However, when it came to the Genesis Testament novels and other things, he had a very spotty memory. He also knew the various spin-offs that came out of the franchise. At this point, he has a pretty good general idea of just what kind of world he lives in.

This world was the world of A Certain Magical Index. And the titular title belonged to the white nun who was still hesitating about whether to stand still at the door or walk inside. The Index Librorum Prohibitorum. A keeper of deadly grimoires. The young man shuddered a little. If this were his first life, he would have immediately tried to contact a friend of his, a Sorcerer Supreme, who knew how to handle a delicate situation like this.

Though, as he looked at his right hand, he grimaced a little. In his first life, the Sorcerer Supreme had taught him a specific spell that could reach cross-universal distances. It doesn't matter where or when, the Sorcerer Supreme would be able to intercept the call. The problem was that he had Imagine Breaker. He could not be able to cast any kind of magic, never mind the magic of this world, which he would rather not like to make use of. He knew that magic was a very big problem in this world. On the surface, the untalented people, if they learned enough and trained enough, would be able to do things that ranged into the realms of the fantastical.

...But.

This kind of magic - the magic of this world - has a price to pay.

As he was deep in thought, he noticed that the nun in white was now drawing close to him, closing the door on the way inside, though she was still very hesitant. Her emerald eyes were lowered, as if feeling guilty, as if not knowing what to say, as she cutely touched her fingers and twirled them a little.

There was silence. The young man was content to wait until the nun in front of him would be able to speak up. The minutes of waiting felt like hours had passed. The nun, having lowered her gaze, would try to formulate something from her mouth, only to close it, but then started to open again, only to close it. The young man never liked the face she was making. He knew that this was a young girl, only fourteen years of age, who had her memory wiped over and over again. It was something rather inhumane, to be stripped of everything you knew, to be forced to forget even one's loved ones, to live for a year on the run, it was not something the young man wished upon anyone.

"...Ar-...Are you okay?" Index quivered, her eyes threatening to draw down a little tears. The fact that he made this young girl cry for him was not something he took lightly.

He smiled gently, gesturing Index with a little pat on the side of the bed, somewhere on the left. He did not answer her question directly, but he opted to answer with this.

"Do you want a hug?" he asked.

Index, shaking a little, with eyes widening, would slowly hum with a nod and a little smile that was more precious. She would head towards the young man's bed, towards the left, where she would happily embrace him.

There was no need for any more words. After everything that had happened, the young thought that this young girl needed a hug after everything she had been through. He could hear her sniffing a little, so he would gently pat her on the back with his left hand. When recalling the original version of how this scene went down, he thought to discard that altogether, because the young girl needed something more grounded and sensible, and so did he, since he had a lot that he needed to process.

It was almost afternoon.

The young man would gently touch Index's hair while she slept on his chest. Once upon a time, before gaining the memories of his first and second (sort of) life again, he'd probably try to make a big deal about this. He would scream about gaining a red flag or this is something that would forebode even more misfortune or something like that.

But not now, not Touma Kamijou as he is now. Though, that begs the question. Would he still be considered Touma Kamijou, after regaining the memories of his former identity?

"("I guess this is what Logan probably felt like back when he lost most of his memories...")" the young man thought sadly.

And then...

"I can see that you're awake."

...The young man turned serious as he looked to the right and saw a medical doctor with a bald head that had a few grey hairs and a frog-like face who was sporting a professional expression. The young man knew who this was.

"I was quite surprised, you are handling this rather well than I would have expected."

"I tend to think of life having a bunch of surprises... Heaven Canceller... ...or should I call you Charles Henry Allan Bennett?" the young man said, with no mince for words.

"...!"

For what felt like the very first time, Heaven Canceller was very surprised. But that surprise would eventually fade as a blank and professional expression. "...I wonder what do you mean when you would call me by that very name?"

The young man would breathe with a heavy sigh before he continued. "For a doctor, it is best to just do what the patient says when it comes to the occult, at least, that's what you often tend to say... ...and," the young man would look to the windows. "...An old friend of mine would say something similar." the young man would turn back to Heaven Canceller. "The study of medicine and the occult are quite interconnected since ancient times I would say, and... ...no ordinary doctor would just listen to the ramblings of a nun, not here in Academy City, and you are no ordinary doctor. You knew very well of what my condition was when you told Index about it. Memory destruction."

The young man continued. "My brain cells were destroyed, erasing every memory that I have ever made in my past... ...But, in exchange, I got something else. I would like you to hear of what I now remember."

"...Go on," Heaven Canceller encouraged the young man to continue.

"...Before I do, I need you to promise me something. You would tell no one, and I mean no one, about what am I about to share. Not to your fellow doctors in the hospital, not to any esper, not to any magician, not to anyone in general, but especially do not tell Aleister Crowley, the Board Chairman of this city... ...though," the young man grimaced a little. "...I would not be surprised if he would know of my current predicament. Besides, you never know when he'd be listening."

Heaven Canceller narrowed his eyes, his interior thoughts being a little mysterious. "I can assure you then that he would never hear of what you have to say to me. He and I made an agreement to never interfere with each other's business, unless my patients are being put in danger because of his actions. Whatever you are about to say is strictly confidential between just the two of us."

"Good, then I would like to introduce myself, my real name," the young man nodded before softening his serious expression, raising his right hand. "My name is Steven Grant Rogers, most people would call me Steve."

Heaven Canceller raised an eyebrow as he drew near to the patient on the bed. He would shake it, noticing his firm grip. "Steve... ...I take it you were a soldier then."

"That's correct, doctor," Touma nodded.

"What manner of soldier were you then, if I may ask?" Heaven Canceller asked with a hint of curiosity.

Touma smiled a little. "A Captain."

Insert Song: End

OP Song:

Ivy Levan - Who Can You Trust (From The SPY Soundtrack Album)