Matsumoto ends up staying at her friend's house. Taking advantage of her husband's absence, she begins seducing Miki Sato. Miki, overwhelmed by the temptation, surrenders herself to Matsumoto. However, her husband notices their actions and quietly watches from a corner of the room. In the end, Miki is made to climax in front of her husband. This unexpected turn of events drastically changes the relationship between the two women.