Nanami accepts an invitation to a reunion only to discover that her ex arranged for the two of them to be alone. Both are married and dissatisfied with their sex lives, so he suggests secretly making each other feel good for one day. She hesitates but gives in to his passion, sucking him until he ejaculates in her mouth. When he tries to penetrate her, she panics and runs home, only to masturbate furiously while remembering him. Knowing it is wrong, the young wife still answers his next invitation and returns to drown in adultery.