The Fifth Holy Grail War in Fuyuki City has reached a critical juncture, endangering every participant as the concealed foe finally emerges. When Shirou Emiya, Rin Tohsaka, and Illyasviel von Einzbern uncover the truly corrupt nature of the darkness that has been ravaging the city, they grasp the gravity of the crisis. To safeguard those they cherish, the trio must confront an almost unbeatable enemy—despite some adversaries having once been allies or even closer. As the climactic phase of this tumultuous war unfolds, Shirou"s convictions face a painful test: can one truly rescue a world that appears doomed?
