Miyo Sasaki, nicknamed "Muge" meaning "infinitely mysterious," has a bright personality and is full of energy at school and at home. She is also in love with her classmate Kento Hinode. Miyo tries repeatedly to get Kento's attention, but he takes no notice of her. She realizes that the only way to get close to him is to transform into a cat, but at some point, the boundary between herself and the cat becomes ambiguous.