From This Day On, I Am Young Hero Emiya

"In the name of the curse, Saber, destroy the Holy Grail!"

In the city engulfed in flames, Kiritsugu Emiya wandered aimlessly. The dream he had hoped to achieve with the Holy Grail—world peace—had been shattered.

He would never forget what the Holy Grail had shown him: "You want eternal peace? Then kill all the humans in this world!"

What a joke. If all humans in this world disappeared, what would be the point of peace?

He lay on the ruins left by the black mud, painstakingly removing the debris piece by piece. At this moment, he suddenly realized that this feeling was exactly what he wanted. No need to sacrifice anyone. He could extend a helping hand to anyone equally, and no one would be sacrificed.

With this thought, Kiritsugu sped up his actions.

"Still alive! Still alive!" For a moment, the man who had once become the nightmare of magus, known as the Magus Killer, wept uncontrollably.

"Thank you, thank you for being alive! Even if it's just you, I've finally found someone alive!"

Kiritsugu Emiya cried and laughed, his gratitude to heaven was enviable.

The two surviving Masters of the Holy Grail War in Fuyuki City were almost broken. Kiritsugu was like this, and that Father Matou was laughing like a child playing with feces.

Kiritsugu Emiya excitedly embraced the survivor he found. As he was held, the red-haired little boy coughed a couple of times.

In the darkness, he struggled continuously.

Where is this? He didn't know.

He couldn't breathe, had no sight, no sound, no smell, and no touch! The only thing left was an inexplicable sense of weightlessness, a feeling like being stuffed into a water balloon in outer space. He didn't know how long it lasted until, at some point, he felt a violent impact.

It felt like being hit by a rocket during liftoff, and he immediately lost consciousness.

"An unfamiliar ceiling! Huh, why would I say that?" In a hospital in Fuyuki City, the red-haired little boy opened his eyes. "Wait, I can speak Japanese now? Is this... a hospital? Ah, my head hurts so much."

The hospital room door opened, and a young man entered. "Ah? You're awake? That's great! I'm Kiritsugu Emiya, what's your name?"

"Emiya... Kiritsugu?" Looking at the young man's face, the boy nodded, then shook his head. He had a general idea of his current situation. He had transmigrated!

Thinking was easy. He was a modern-day Chinese otaku who had read more fanfiction than textbooks. The decor here was clearly Japanese, and with this Mr. Kiritsugu Emiya, if he still couldn't figure it out, he should go register at the neurology department.

Kiritsugu Emiya was now in the state he was during the FZ storyline, and since he was alive now, that explained things.

"Fate/Zero?" he muttered.

"What?"

"No, it's nothing. It's just... I seem to have lost all my memories."

Given the current situation, it was better to pretend to know nothing. His head was still bandaged, making the pretense of amnesia incredibly convenient.

"Is that so? You've forgotten your name too?"

"Yeah!"

"Then let me give you a name. How about Shirou? Emiya Shirou. You'll live with me from now on."

So, I've transmigrated into the young Emiya? Emiya... Shirou?

"Hey, what's wrong? Don't you like the name?" Seeing that Shirou would call him that for now, and seeing Shirou's lack of reaction, Kiritsugu thought he disliked the name.

"Um... Huh? No, it's nothing. The name Shirou sounds good, and Emiya sounds good too. I quite like this name. I like it." Renamed Emiya Shirou, he responded expressionlessly.

"Hey, hey, don't be so listless, you're still so young." Kiritsugu didn't seem satisfied with Shirou's reply.

"...What does it matter? I'm just listless, I'm not going to die!" Shirou indicated he didn't want to talk anymore and gave Kiritsugu a side-eye.

...Damn it, this kid is better off not speaking. When he does speak, he's so infuriating!

"How are you feeling now? Does anything hurt or feel uncomfortable?" Kiritsugu asked.

Shirou didn't speak and directly pulled out the IV drip from his arm.

"Hey, don't push yourself!" Seeing this, Kiritsugu couldn't help but worry.

Ignoring Kiritsugu, Shirou threw off the covers and tore off the bandages on his body with his hands.

Hiss—

No one knew where Shirou's small body got the strength from, but he tore off all the bandages at once.

"Hey! You—"

Kiritsugu was about to say "Don't push yourself," but when he saw Shirou's perfectly unharmed body, he couldn't say anything.

"It's okay, my recovery ability is quite good. These injuries have already healed."

"..." With this level of recovery ability, was this child a humanoid Phantasmal Beast? It was almost comparable to Avalon!

This was no joke. When Kiritsugu dug Shirou out, Shirou was in a half-dead state, but he was clearly still salvageable. Compared to Shirou in Fate/Zero, the injuries were much lighter, so Kiritsugu didn't implant Avalon into Shirou's body.

But looking at him now, even without Avalon, Shirou's recovery ability was far beyond what he, Kiritsugu Emiya, could match. It had already surpassed the human realm.

Could it be because of the Holy Grail? Kiritsugu Emiya thought to himself. After all, the Holy Grail was the product of the Third Magic. As a product of magic, even if that magic was not mature and was only a half-finished product, it couldn't be understood from a common-sense perspective.

But what was the truth? Let's rewind—

Generally, people who transmigrate have died before, and Shirou was no exception. He wasn't supposed to transmigrate, but after he died, he was bumped into by another soul, causing the two soul bodies to merge into one.

This "driver" who caused the accident was also quite a famous guy. He was Ulquiorra Cifer, the Fourth Espada under Aizen from Bleach!

Because "Little U" died more thoroughly, Shirou successfully gained control of this spirit body. In the words of Whitey, he became king.

After the fusion of the two souls, Shirou acquired all of Little U's abilities. Although Little U was already dead and had lost most of his power, requiring time to recover, abilities like super-high-speed regeneration were all intact.

Everyone knows how advanced Little U's super-high-speed regeneration is. As long as the internal organs are undamaged, he can recover even with missing limbs.

The injuries sustained in the fire were severe, but for an Arrancar, they were just a light drizzle. If not for the loss of power, he could have recovered as soon as Shirou transmigrated.

That concludes the rewind.