Non and Yohei were childhood friends before marrying, but after several years together he grows cold—and she discovers his affair. Devastated by her husband’s betrayal, Non finds comfort in his father Ippei, who lives next door and has always treated her kindly. Her old feelings for him return, and she catches herself subtly tempting him. Finally making up her mind, she heads to Ippei’s bedroom to act on her forbidden love.