Miyo "Muge" Sasaki is a strange second-year junior high student in love with her classmate Kento Hinode. Every day, Muge relentlessly pursues Kento, but he pays her no attention. Muge pursues Kento despite the fact that she is carrying a secret she cannot reveal to anyone. Muge stumbles upon a magical mask that enables her to shift into Tar, a cat. Muge's magic enables her to approach Kento, but it may eventually render her incapable of reverting to human form.