Shirô 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 strange battle that changes his life.
Rin takes Shirô and Saber to the church in New City. She introduces Shirô to Kirei Kotomine. Will Shirô accept to participate in the Holy Grail War despite all the danger?
Rin, Archer, Shirô and Saber run into a girl named Illyasviel von Einzbern and her seemingly unstoppable Servant, Berserker, in a long-ranging battle that could destroy the four of them.
Shirô 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.
Archer finally arrives at the scene in the school. Rin fills him in on what happened. Together with Shirô and Saber, they plan to find out who the real Master of Caster is. After losing Rider, Shinji heads to the church.
Rin suspects Kuzuki might be the Master of Caster. With the help of a hesitant Shirô, she implements a dangerous plan in a remote location to test out her theory.
Rin finally asks Shirô out on a date, but their enjoyment is cut short when Caster makes her move. Shirô is forced to make a difficult decision to protect the people he cares about.