Yayoi is a high school girl/spiritualist who defeats the demon prince Ura and entraps him in the form of a black cat. Yayoi is unusually strong, determined, and unperky for a manga heroine, and I like that she's in control of Ura and their relationship, but the relationship does move too much by rote. Of course sometimes he has to transform into his sexy self, he doesn't really try to hurt her, etc. etc. I would have liked more tension and antagonism for the two of them to overcome.