Mizuki Nanako

Nanako Mizuki is a student at the Musashino Public High School, in a class of troublemakers that Eikichi Onizuka is assigned to for teacher training. Initially, she agrees to set Onizuka up, seducing him into taking her back to his apartment, where she undresses for him. At that moment, some of the boys from the class take a picture of Onizuka and Nanako together, threatening to release it to the media, if he doesn't pay a large sum of money. However, Onizuka is able to "persuade" the boys to keep quiet, with a little help from his old biker gang.
Despite the set-up, Onizuka agrees to take Nanako back to his apartment, after she insinuates he might be able to sleep with her. However, this is just a ruse, when she explains that due to her parents having no time for family bonding anymore, because of their tight jobs, Onizuka's small apartment reminds her of the time when her family used to live in these conditions and were much closer. This moment sparked Onizuka's revelation of actively resisting the urge to sleep with his female students.
Onizuka solves her problem by walking into Nanako's home with a sledgehammer, bashing a hole in the wall separating her parents' bedrooms, assuring her the wall will not act as a barrier between Nanako and her parents. Her parents have the physical hole filled, but she realizes that time and her efforts can heal the spiritual rift in their relationship. To show her appreciation, she briefly, and without panties, flashes for Onizuka, promising that he'll be the one to take her virginity. She does not reappear in the manga or anime, after this.
In the live-action, Nanako studies at Holy Forest, so as to keep her character. Fortunately, her story remains the same as her manga and anime counterparts. Here, she affectionately calls Onizuka, "Onichi", and fills in the group role of Kunio Murai for Kōji Fujiyoshi and Tadaaki Kusano.

Wikipedia