The Ancient Magus' Bride

Talk of the devil, and he is sure to appear. (1x7)

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The dog, with its flowing, black hair and burning red eyes, called Chise by the name "Isabelle." The Church's final request is to investigate a black dog that emerged in a cemetetry, but the black dog ends up saving Chise from danger. Meanwhile, Renfred's apprentice, Alice, is also on the move, looking for the black dog.