Bishop no Wa

Sinopsis

During a college archaeology club outing, Kana and her boyfriend Reiji discover the frozen body of an ancient bishop. They accidentally disturb a stone pattern around him, releasing a hundred evil spirits, or "oni," that the bishop had contained for centuries. The bishop's spirit tasks Kana and Reiji with recapturing these spirits. As a curse and incentive, Reiji is transformed into a horse during the day, and Kana into a hawk at night, preventing them from meeting in human form until their mission is complete.