Let's start with a man.
[Weaving the container... Weaving successful.]
The man who once had brief happiness, but was ultimately deprived of it by fate.
[Fate Diagram implantation in progress... Implantation successful.]
His sister was taken by his best friend, becoming a sacrifice for all of humanity.
The kouhai who deeply loved him had her heart taken by her brother because of him.
In his despair, he cried out to the Hall of Heroes, but the only one who responded was... himself.
[Heroic Spirit (Emiya) template loading... Loaded successfully.]
The people who mattered to him were gone, the honour he had inherited had been abandoned. What remained, what was exposed was an irreparable emptiness.
[Class proof: Berserker, Assassin, Archer... Registered.]
He abandoned his dreams, betrayed his role as Guardian of Humanity (Emiya), and became the most reckless, the most thoughtless evil, ending the Holy Grail War in a single night.
He never became a hero of justice, but... he won.
[Detected Gaia's interference... Interrupted.]
[Detected Alaya's interference... Guardian status revoked, all abilities reduced.]
He successfully made his wish, redeeming his sister, but ultimately, he was no match for the sword that cleaved the world. He fell, defeated amidst the neverending snowstorm.
In a quiet dungeon, the dying man awaited his end—his Fate.
[██ has been returned, converting... Fusion successful.]
Just like how King Solomon, the moment he became an ordinary person, glimpsed humanity's incineration; and just as King Gilgamesh, in his half-dreaming, half-awake state, observed the true cause of humanity's destruction—this man too, saw the fleeting glimpses of the future before his consciousness faded away.
It was a brief moment of fleeting joy.
It was an inescapable spiral of fate.
The man realised that his sister, in the end, would still return here, to this despairing world—Fate.
[Innate skill: Endless Regret... Forcibly acquired.]
Ah... it's all still futile.
In his final moments, the man sighed .
Inside a broken, doll-like body, the emotion of regret struggled to surface. If only he had realized his limitations earlier, if only he had understood his true feelings sooner... If only there were someone more resolute and stronger than him, to take his place and walk this path...
Might have been saved.
[██ Activated... Searching... Suitable individual found.]
[Individual name: Emiya Shirou.]
[New individual implanted. Container activating... Activation successful.]
[Transferring memory... Transfer sucessful.]
[Ability parameter Luck increased to B.]
When the new consciousness awoke, opening those pale golden eyes, what he heard was the dying man's final wish.
"Don't forget, you promised her... You'd take her to the seaside…"
So, this was the beginning of the distorted origin.