Ep. 1: Chiyoko Kurotori invoca a Gyubid e investiga un fantasma escolar

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When Chiyoko "Choco" Kurotori attempts to summon Cupid with a stuffed nose, she instead summons the black witch, Gyubid, who decides to train her to become a black witch. Her first job involves investigating a ghost roaming around her school. (Source: Wikipedia)