Nachi is a young wife who has been married for six months and lives in a housing complex. One day, she is invited to lunch at the home of Kanzaki, the manager of the housing complex. After the meal, Mrs. Kanzaki goes out shopping, leaving Nachi behind. When Kanzaki's husband returns home, a trivial incident leads to them having sex. When Mrs. Kanzaki returns home from shopping, she witnesses everything and scolds Nachi. The next day, in the hallway of the housing complex, Kanzaki's husband tries to have sex with Nachi again, and although Nachi refuses, Kanzaki's technique makes her climax...