Miki is a married private tutor who used to be a teacher at a prep school before she got married. She quit her job as a private tutor after getting married, but she started working again to make ends meet. Although her husband is a hard worker, their sex life is lackluster and she is frustrated. One day, Miki is shocked when one of her students shows her a smartphone with a video of him having an affair. From then on, she is subjected to a wave of sexual harassment, and she is treated as a submissive masochistic pet by not only her son, but also her friend and father, becoming a sex toy.