Miyo "Muge" Sasaki is a strange second-year junior high student in love with Kento Hinode. Muge chases Kento every day, but he ignores her. Muge pursues Kento, despite her secret. Muge discovers a supernatural mask that transforms her into Tar, a cat. The power enables Muge come near to Kento, but it may also prevent her from reverting to human form.