Chizuru is a carefree second year female student at Kouta's school. She appears to be a normal, albeit big-breasted, teenage girl, but she is in fact a 400-year-old powerful . When she changes form, her hair goes from black to blond and she gains fox ears and a tail. She is constantly hanging around and on Kouta, as he is the only male she acts genuinely towards. She loves Kouta very much and wants to enter a "relationship of sin" with him. She is a very straightforward person and makes almost constant sexual suggestions and actions toward Kouta. She is also a terrible cook, though she improves later on, and shows some interest in .
In the manga, her love for Kouta is undeniable and always considers ways of getting intimate with him. Recently, Chizuru has realized that Kouta is turning into a yōkai like herself, and that he has gained a portion of the Eight Dragons power which resides in her. She has no recollection of her past until she met her foster mother Tamamo, the nine-tailed fox. All that is certain is she can hone her powers as long as she is beside Kouta.