Sailor girl was taught to have perverted sex for the whole year before graduation by a homeroom teacher she hated.

Hiyori, 18 years old, has become a homeroom teacher whom he hates so much that he dies in the new semester. He's awful and terrible person with his eyes to see himself. My teacher asked me to organize the library, and as I was working, I became daze-eyed... In fact, her water bottle was filled with sleeping pills. She is made to sleep and raped by her creepy homeroom teacher... From that day until graduation, Hiyori becomes a toy for her homeroom teacher and is taught to have various perverted sex. A record of an old man teacher who devours his young body in spring, summer, autumn and winter.