Shirou Emiya is a high school student who always helps people around him whenever he has a spare moment. His dream has always been to become a hero of justice. One night, he stumbles upon a battle between two Servants...

Saber tells Shirou all about Heroic Spirits and Noble Phantasms. She explains why she doesn't want to reveal her true identity to him. Shirou wants Saber to stay at his place for a while. Will Fujimura approve this request?

Shirou continues his training with Saber. She is glad that his abilities have improved, but there is something different about his technique. Meanwhile, Rin suspects there is a fourth Master at school.

Wishing to avenge Archer and destroy the Holy Grail once and for all, Rin and Shirou consider their options and try to come up with a strategy.