Female Teacher: Cherry Boy Hunt (1976)

Original title: 女教師 童貞狩り

Tokuko Watanabe plays Hikaru, a female teacher at an all boy's high school. Yata is a mysterious student who transfers from another school. Seemingly, he's the younger brother of a boy who com-mitted suicide because of an obsession with teacher Hikaru. Obviously, as these stories go, Yata wants to avenge his brother's death. So one day, he recruits two more boys and the three of them rape Hikaru on the roof of the school. At first, the violated teacher shrugs off the incident with a "boys will be boys" altitude. But then, when she realizes revenge was the motive, she stalks them before they can do any more damage.