Reiko (Reiko Sawamura) is a strict teacher feared by her students, but at the same time she is secretly having a relationship with one of her students. A teacher by day, a lewd woman by night. Reiko uses these two faces to enrich her work and her private life. Recently, however, her student has begun to crave her body inside the school, unable to wait until after school. Right in the school's blind spot, where other students are, the student's penis is forced into Reiko's body. If she makes a sound now, she will be found out. Reiko desperately tries to hold back her voice, but the student's thrusts continue to pick up momentum...