In Fuyuki City the Fifth Holy Grail War is poised to begin, a protracted conflict of bloodshed, death, and sorrow. High‑schooler Rin Toosaka has dedicated her entire life to this instant—to become a magus capable of serving as a Master in the war. Summoning her Servant, Archer, Rin finally steps onto the battlefield. The city trembles under the looming threat of rival Masters, and Rin's resolve is tested by the weight of her lifelong preparation. Learning that a familiar, Shirou Emiya, has also been pulled into the war, Rin proposes a temporary alliance. As they grow closer, Rin learns more about Shirou"s destiny and principles. Yet her aim stays unchanged: to seize the all‑powerful relic that grants wishes to those who emerge victorious—the Holy Grail. Remains determination.