Bleach

Ashido, the Shinigami Who Came from the Past (7x17)

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Nell and her group are captured by a group of Adjuchas and Ichigo sets out to find her with the others. Meanwhile, Rukia sets out to find her friends with Ashido's help. They are confronted by Adjuchas and Gillian along the way and forced to battle. Ashido's past is eventually revealed as they travel and Rukia learns about the story behind his mask.