In a Holy Grail War, Masters command legendary Heroic Spirits, battling to claim the Grail—an artifact rumored to grant any wish. After the Fifth War in Japan concluded, new omens stir in Snowfield, a western American city built for conflict. Masters and Servants start converging, but this war is anything but ordinary: a missing Servant class, impossible summons, and a nation veiled in secrets. These anomalies warp the sacred conflict into madness. What follows is a twisted masquerade, where humans and heroes are forced onto the stage of a counterfeit Grail.