Emiya discovers the origin of the spell field only to be greeted by the Servant Rider, who controls the spell. Saber arrives to help fight, but the Rider escapes with hardly a scratch. Meanwhile, Tosaka proposes that she and Emiya join forces, to which Emiya agrees immediately. But will she still want to fight on Tosaka's side after she's kidnapped by Rider and discovers that the Rider's master is none other than her childhood friend Shinji?
