Ep. 4: Tokiomi proposes an alliance while Kirei assassinates his father to secure a new contract.

Following Risei’s death, Tokiomi meets Irisviel and Saber to propose a temporary alliance against other Masters. Irisviel agrees only if Kirei leaves the country. Before departing, Tokiomi gives his daughter Rin a magecraft book. Irisviel later reveals to Maiya that she is the Holy Grail’s human vessel and will die to activate it. Meanwhile, Kirei learns from Archer that his father left him Command Seals, allowing him to contract a Servant. The war’s secret requires sacrificing all seven Servants to activate the Grail. Tokiomi avoids using his seals to force Archer’s suicide later. Kirei meets Tokiomi, who entrusts him with Rin’s guardianship and an Azoth dagger. Kirei stabs Tokiomi, claiming his father never understood him. With Tokiomi dead, Kirei and Archer form a Master-Servant contract.

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