Nana Minoru, a busty wife who lives in a housing complex, suspected cheating when she saw her husband, a salaryman who frequently emails someone. One day, Nana Minoru witnessed her husband walking with a young woman. She was masturbating like crazy because of regret and frustration, and she met her neighbor's middle-aged man through the open window. A man who sits down on the ground saying that he was not offended. The two, who should never have met, have a relationship that makes them sweaty after witnessing this masturbation.