The first teacher Eikichi Onizuka encounters at Musashino Public High School during his training is Hidero Ohsawa, who has a notorious reputation for having sexual relationships with his female students. Ohsawa convinces Onizuka that teaching high school is a surefire way to lose one's virginity, suggesting that the idea of having a beautiful 16-year-old wife, even at the age of 40, is incredibly appealing to the 22-year-old Onizuka. When Ohsawa learns that Nanako Mizuki has been staying over at Onizuka's apartment without any romantic developments, he insists that Onizuka should force himself on her and videotape the encounter to ensure she remains silent, thus preventing any "waste" of Onizuka's potential relationship. However, Onizuka does not heed Ohsawa's advice.
Ohsawa is not seen again after Onizuka completes his training, but it is later revealed that he was caught having an affair with a student and was subsequently sent away for another training session, away from Musashino High.
