SSNI-923 A sailor-suited girl, Yoshioka Hiyori, was subjected to perverted sex acts by her most hated homeroom teacher for a year until graduation.

Hiyori is 18 years old. In the new school term, her most hated teacher became her homeroom teacher. The way he looked at her was disgusting and despicable. While she was organizing the library as instructed by the teacher, her consciousness became hazy... It turned out that her water bottle had been laced with sleeping pills. She was made to sleep and then filmed while being raped by her disgusting homeroom teacher... From that day until graduation, Hiyori became a toy for her homeroom teacher, subjected to various perverted sexual acts. Spring, summer, autumn, winter—the record of an old teacher preying on a young body.