The rules of the game have changed and the Masters have a chance to earn an extra command spell. All they have to do is find Castor and kill him.

Battle rages throughout Einzbern Castle: Kayneth's magical mercury sphere versus Kiritsugu's formidable gun arsenal, Saber and Lancer join forces against Caster in the forest, and Irisviel detects a new enemy as she and Maiya make their escape.

Kiritsugu and company are wrapping up after the assault on their castle, and the Einzbern Master decides to ignore Saber's desire to pursue Caster, instead leaving on his own to finish off Kayneth. But Kayneth, after being saved by Lancer, has awakened to find himself bandaged and strapped to a bed. Sola-Ui explains the hopelessness of his current situation, and offers a shocking proposal...

The mystery of the mass kidnappings in Fuyuki remains unsolved, with more kids disappearing daily. When Tohsaka Rin can't get in touch with her friend Kotone, she braves the darkness and enters the city on her own to search for her. That's when she spots a strange man leading two kids around and decides to follow him...