During a fight with the devil Ura. Yayoi's power turns the devil into a black kitten. Now, even though Ura doesn't hide desire to "eat" Yayoi's power when he gets the chance, they develop an interesting relationship: The two begin living together, and Yayoi takes her new feline "friend" on her adventures.

    So when Mitsuru is in danger of losing his weekends to extra history classes, he convinced his sister to swap clothes with him and ace his tests! After all, how hard can it be fro them to play each other?But Megumu can't rely on just her book smarts in Mitsuru's all-boys, delinquents' paradise of a high school. And Mitsuru finds life as a high school girl to be much more complicated than he expected!