Rin Tohsaka, a young girl, finds her father's memento. All she has is a catalyst and a pendant. She sets out to summon Saber, a powerful spirit.

Shirou is devastated since he was unable to save Illyasviel. Together with Rin, he is determined to fight Caster and the others. Out of the blue, they are visited by a Servant who is willing to lend a hand!

Rin and Shirou begin their battle against Caster and Kuzuki while Lancer faces off with Archer. Will Rin's plan work in the end?