Chapter Text
Disclaimer: I own neither Fate/Stay Night nor High School DxD
Prologue
The first thing Shirou noticed upon waking was the smell.
Hospitals always had a distinct scent—disinfectant, synthetic linens, cotton
That, in itself, should have been a relief. But instead, it unnerved him.
The second thing he noticed was that he had no idea how he got there.
He wasn’t dead. Not quite. His body hurt in places that told him he had been alive for at least a little while. Healing, even.
The last thing he could remember before that was fighting against Gilgamesh, the King of Heroes and using up all his mana just as he was about to deliver the finishing blow…then
The holy grail got destroyed and Gilgamesh decided to use his chain shaped noble phantasm to drag Shirou with him to that black hole started by the grail.
“then...what… happened?” Shirou can’t remember anything except the sharp pain and Archer shouting that only he is allowed to kill him
“Hn” his body is sore, probably from lying on the bed for a long time.
Oddly he felt kind of relived he died like a hero of old... fighting a legendary hero, Gilgamesh, who was supposedly the ‘King of Heroes.’ With arguably one of the strongest noble phantasms. A noble phantasm that housed a near unlimited number of more noble phantasms…
In hindsight, Shirou was thankful that the Servant underestimated him. In a real fight where the King of Heroes were to use his full strength from start, even with the mana boost Rin’s magic crest gave him, he would have been defeated instantly.
“……” Shirou took a deep breath.
The very world around him was different. The difference in concentration of mana was sufficient for even someone like Emiya Shirou to notice it. At first he thought he must be in some location with high mana, but why would a public hospital be built in such a place?
And indeed, this was a public hospital. Ordinary hospital equipment, ordinary nurses… Everything was ordinary... except for the nurses
They were fallen angels from the Biblical mythology the ones that rebeled against God and a surefire sign that he died and is probably in a hospital in purgatory
…
“Ah! Good you are awake!” man whose hair was somehow black with golden bangs and a black goatee stepped over to the edge of the bed and sat in the visitor’s chair “Right let me introduce myself I am Azazel”
“The archangel of death “Shirou muttered “I am dead aren’t I ? ”
“Er..well former Archangel and no your not dead otherwise you’d be meeting Gabriel instead “Azazel cleared up “Right leaving that aside how do you feel now “
“Err … sore, and a bit confused,” Shirou replied honestly, glancing down at his hands.
Azazel gave a satisfied nod. “Confusion is normal... You’ve been out for a few weeks after all “
“You saved me...thank you “
Azazel grinned. “Correct. I’m the guy who found you half-dead in a crater and made sure you didn’t get dissected. You’re welcome, by the way.”
“…Crater?” Shirou repeated
Big one. Smelled like melted steel, divine backlash, and identity crisis.”
That last part didn’t even make sense but Shirou nodded mutely
. “So… I didn’t die?”
“Well, you almost did. Kind of spectacularly, too. Thing is...say do you not feel anything different like your magic power or like you have phantom limb-I mean wings ?”
Shirou gave him a blank stare
“Close your eyes and imagine the strongest thing that comes to mind.” Azazel explained “It will work as a trigger “
‘Oh so that’s what he meant ‘
“Trace on” Shirou tried to open his circuits. The response was immediate—like opening an overflowing dam. The mana grushed out of him like a flood and then the pain
Horrible pain as something grew from his shoulders ripping off flesh and blood
Shirou rolled down painfully down the floor straining the white tiles red
Ha———ah”
‘…It’s hot...Hundreds of blades are growing out of my body.... an inescapable death by skewering.’ Shirou tried to breath ‘I..I...can”
I am the bone of my sword.
Shirou heart almost explode from the sudden bust of energy from those words that echoed in his mind
Vaguely he heard Azazel shouting for a doctor
A warm sensation bloomed deep in his chest, cooling the firestorm spreading through his nerves. It pulsed once. Then again. Steady. Calming. Familiar.
‘... Avalon...!’
The pain slowed. Torn muscle knit itself together. His breath came easier, though each gasp still hurt.
Azazel had burst back into the room, having found two nurses and a frantic-looking doctor. All of them stopped dead at the sight.
Azazel’s mouth worked soundlessly for a second. He pointed.
“That—okay. Okay. I was not expecting that.”
“Sacred Gear? No, doesn’t fit the activation pattern. That backlash was way too severe. And the energy signature... holy and Fae?” He glanced up at Shirou, eyes wide with manic curiosity. “Is that a Fae construct? The resonance... no wonder the mana’s off the charts.”
Shirou blinked, still panting. “You... what did you do to me?”
“Well, technically, I saved your life. Mostly.”Azazel gave a sheepish shrug “I revived you as an angel “
He fished into his coat pocket and pulled out a small, white card. It was blank, except for a faint shimmering trace at the center.
“This was supposed to be a prototype— angle card...a type of artifacts that can transform humans into angles.This was supposed to be gamble considering prototype Saint was never really used for human subjects I mean it should have worked perfectly in theory but even so this blank card, with only basic features, no alignment was successful in stabilize your soul and reviving you.”
“You Gambled !?” Shirou cried, still gripping his ribs. The pain was receding slowly, but the sensation of swords shifting behind him hadn’t stopped.
Shirou staggered to his feet, one hand braced against the wall, blood smearing across the sterile white tiles.
Breathing hard, he reached back instinctively—his fingers met something solid. Not flesh. Not bone. Cold, ridged steel.
He turned, unsteady, and caught his reflection in the room’s glass panel.
And froze.
Two rather lean wings extended outward, each feather of tempered blade. Dozens of them—long, curved, and deadly—jutting from his shoulder blades in perfect symmetry. They shimmered faintly, lined with filigree veins of golden light
“You were on the brink of death, body torn apart by blades, soul hanging by a thread just minutes from disintegration...it was the best option and it worked perfectly fine too this greatly accelerates my research “ Azazel waved off oblivious to Shirou’s shock “Congratulations... young mage! You’ve successfully undergone ascension. You’re now the first angel of this new angelic system...and also the first mutant angle too”