Across dimensions and timelines, Emiya Sakatsuki exists as paradox incarnate—the anomalous Knight of the Round Table, Chaldea's moral compass, master of the Third Magic, sovereign of the Lostbelt, and the one being Alaya cannot control. This sis-con demigod walks a path few could comprehend. When Emiya Shirou's summoning ritual in Ainsworth Castle's depths pulls forth a soul from beyond worlds, a young man clutching the Fate Compendium discovers his true purpose. Before him lie trials both extraordinary and inescapable: a withered world where the Root has faded, a catastrophic Holy Grail War spanning fourteen Heroic Spirits, and a Grand Order threatening humanity's very survival. Each cycle demands more. Each summoning fragments him further. Every world requires salvation. Yet beneath the weight of endless responsibility burns a singular desire: peace. Stability. The quiet life Merlin claims to live. But as parallel selves multiply and destiny's threads refuse to untangle, one truth becomes undeniable—he's already been scattered across infinite versions of himself. "Onii-chan, weren't you already split into pieces from the start?" In a system where heroism demands sacrifice, can even a man of justice find salvation?