Non and Yohei have been childhood friends since their school days, and have now been married for several years. Lately, however, Yohei has grown distant and cold toward Non. One day, the shocking truth comes to light—Yohei has been cheating. Overwhelmed by deep disappointment and sorrow, Non finds emotional support in her father-in-law, Ippei, who lives next door. Ippei has always treated her with warmth and kindness since her youth, and her long-dormant feelings for him begin to resurface. Before she realizes it, she becomes deeply aware of him, eventually making her way to his bedroom. Finally, Non resolves to confess her love to Ippei.