Cardcaptor Sakura

Sakura and the Final Judgment (2x11)

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Sakura initially refuses to fight Yue, but she tries to find card that can confine him without hurting him. She uses the Wood Card, but as its power falls under Yue's sign of the moon, and he turns it against her, and Yue declares she has failed. Sakura learns that if she fails the Final Judgment, everyone who has ever had anything to do with the cards will forget their feelings for the person they love the most.