Shirou and Rin continue investigating the bounded field at the school. Will they be able to solve this mystery and find out who the third Master is?

Rin finally asks Shirou out on a date, but their enjoyment is cut short when Caster makes her move. Shirou is forced to make a difficult decision to protect the people he cares about.

Caster keeps Saber hostage, but Kuzuki is not happy with his Servant calling her own shots. Rin, determined to take out Caster and her Master, orders Archer to take out Kuzuki. Will Archer do as she says?

Shirou's battle with Archer continues. But then an unexpected visitor appears, and new information unfolds.