The boy wished to protect the girl. That was his thought. 10 years after the Holy Grail War - a battle waged by Masters and Servants over the wish-granting container, the Holy Grail - another war breaks out in Fuyuki City. Shirou - the adopted son of Kiritsugu Emiya, a participant of the previous Holy Grail - resolves to fight, carrying out Kiritsugu's dying wish. There's a young girl by Shirou's side who's in love with him - Sakura Matou.