The Holy Grail War is a bloody war between magicians in which seven masters and their summoned followers compete for the Holy Grail, a magical relic that grants the winner any wish. Nearly ten years ago, the climactic battle of the Fourth Holy Grail War wrecked devastation on Fuyuki City, killing over 500 people and destroying the city. Shirou Emiya, a survivor of this catastrophe, wishes to emulate his savior and adoptive father, Kiritsugu Emiya, as a hero of justice. Shirou is thrust into the Fifth Holy Grail War despite just being a student after he accidently witnesses a combat between servants at school and summons his own servant, Saber. Shirou joins forces with a strange shadow who launches a deadly spree in Fuyuki City.