Ep. 17: Mark of the Witch

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With mass comas now occurring within the city, Shirō and the others decide to go after the Master and Servants at the Ryudōji shrine. After confirming that Sōichirō Kuzuki, one of Shirō's teachers, is Caster's Master, Sakura is taken captive by Caster to serve as a sacrifice in order to summon the Holy Grail. (Source: Wikipedia)