Onna Kyoushi Yumi no Houkago

Yumi, a dark-haired teacher with a curvaceous figure, finds her personal life unraveling. Following a difficult end to her engagement, she becomes the target of harassment from the Vice-Principal. This situation escalates when the Vice-Principal, alongside several eager students, corners her into a series of intense sexual encounters. After being repeatedly used, she is coerced into an agreement to serve as their private sex slave. Her potential rescuers are Katsutoshi, a hesitant young man, and his lively girlfriend, Keiko. However, given the widespread desire for her among the student body, breaking free from this imposed servitude proves to be a significant challenge.