Female Teacher: Chains and Bondage (1981)

Original title: 女教師 鎖と緊縛

A female teacher with a heavy past who committed suicide with a fellow teacher in the past, and was the only one to survive. However, the woman who was the fiancée of the dead teacher also committed suicide in despair. The younger brother of the woman enrolls in the school where the female teacher is a student in order to get revenge. There are also men at the school who are always after her body, thinking that such a female teacher will easily let them have sex with her. In desperation in such a world, she accepts the perverse desires of the men...