Due to the thin walls of her room, Keiko, the wife, can't help but be bothered by the sex happening next door. Knowing it's wrong, she still listens in, only to be found out by her neighbor, Abe. Disliking Keiko for putting on an act as a model student, Abe pushes her down and uses her as an outlet for his sexual desires. From then on, Keiko spends her days in humiliating training sessions, treated as a sex pet. However, the abnormal stimulation she experiences in her otherwise mundane life begins to transform her into Abe's obedient bitch…
