Mr. and Mrs. "Kurumi" come to help their husband's junior move in. While her husband went shopping at a convenience store, the younger woman begins to make advances toward "Kurumi". In fact, the girls were lovers in the past. In this unusual situation, "Kurumi" gets carried away and engages in erotic acts. The woman's body is on fire, and she falls into adultery herself. The two, who know each other's bodies inside and out, are unable to stop themselves, and they begin to desire each other's bodies. When her husband realizes what is happening, he is so angry and jealous that he takes outrageous actions.