Kaoru Namioki is a 53-year-old housewife raising her husband and son as a family of three. Her daily life is filled with comfort and happiness. Her son has grown up honest and upright, approaching the age where he'll soon become independent. Then one day, she accidentally discovered her son wearing her underwear and rubbing himself intimately. Perhaps she had raised him wrong. Yet to her, he was her beloved only child, and learning that he saw her as a woman made her heart swell with happiness—so much so that she couldn't help herself...