The ongoing Fourth Holy Grail War remains inconclusive as no clear winner has emerged. Despite this, Risei Kotomine, the Church supervisor, rallies the remaining Servants and their Masters to come together in the face of an imminent threat that could potentially terminate the Grail War and devastate Fuyuki City. Nonetheless, the fragile truce quickly collapses as Masters resort to extreme measures in their pursuit of victory. As conflicting beliefs on heroism and chivalry collide, Kiritsugu Emiya and his Servant Saber begin to experience tensions. Meanwhile, Kirei Kotomine, still searching for a sense of purpose, develops a perilous connection with one of the remaining Servants. With time running out, the cost of triumph becomes increasingly blurred, making it difficult to distinguish success from defeat.