Reiko Makihara is a married teacher who tries to protect a student named Tanaka from bullying in class. Unbeknownst to him, she harbors secret feelings for Tanaka, which she keeps deeply buried. One day, while attempting to shield him, she is caught masturbating by the ringleader of the bullies and is subsequently assaulted. Later, in front of Tanaka, she is gang-raped by the bullies in the classroom. However, this traumatic experience awakens her suppressed desires, and she gradually transforms into a sex slave, becoming increasingly obsessed and begging Tanaka for his cock.