Hidden beneath a façade of utopia, Tsukimihara Academy operates as a digital nightmare, the arena for the forthcoming Holy Grail War. Engineered by the Moon Cell system, the campus hosts souls projected from Earth who possess even a sliver of Master potential. Of these 256 entities, half—128 souls—are selected for the main contest and each receives a Servant. Once all Masters are chosen, the academy initiates a purge that targets every remaining living being for extermination.
When Hakuno Kishinami awakens in a pool of his own blood, he rejects the inevitability of death. Driven by an inexplicable surge of hatred, he swears to survive at all costs. As he battles a relentless hunter, he discovers a crimson sword embedded in the earth; extracting it summons his own Servant, Saber, who obliterates the hunter amid a shower of rose petals. With this newfound strength, Hakuno must now head toward Moon Cell"s core—the Angelica Cage—to uncover the truth behind this fabricated realm that has concealed countless secrets and will reshape his deeply everlasting destiny for those who dare to seek the Grail.