The husband's beloved junior colleague, Sugimoto, finishes her branch office assignment and is transferred to the headquarters, and ends up working with her husband. The two of them invite her home for various reasons and take care of Sugimoto, who lives alone. One day, Sugimoto, unable to suppress her lewd impulse, approaches Yuko, and the two have a relationship. Yuko, who was aware of her lack of sexual life after being pointed out by her sister-in-law, is drawn to Sugimoto's charm, which is different from her husband's, even though she knows it's wrong...