A car screams down the moonlit streets of Fuyuki City, with a very happy-go-lucky Irisviel behind the wheel and a slightly unnerved Saber sitting next to her. The evening takes a bad turn when a mysterious shadow darts in front of them. The person claims to be Saber's loyal retainer, yet Saber has no memory of them...

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.

Hidden in a Fuyuki hotel, Kiritsugu tries plan his next move, but is still at a loss trying to understand Kirei's motives. Elsewhere, Iry and Saber have moved to a new hideout, a traditional Japanese manor. But while Iry seems excited about their new location, Saber senses something is amiss...