Riko was living a fulfilling life with her fiancé. Shortly after she started dating her ex-boyfriend, who is a doctor, it became clear that he was no good, and she broke up with him as if to run away. However, one day, her ex-boyfriend locates the two of them and breaks into her home. Riko, who was completely spoiled by her boyfriend, could not maintain her rationality even when her boyfriend returned home, and continued to have sex with him endlessly.