Sachiko Ozawa, in the role of a stepmother and second wife, is cleaning the house when her stepson arrives home before her much older husband. Trying to be considerate, she prepares him a sandwich and shows kindness, for which he offers her a massage and acupressure as thanks. At first, she accepts it in a relaxed manner, but gradually the pressure shifts to more sensitive areas. The soothing sensation soon transforms into erotic pleasure, drawing her into unexpected arousal. The sudden turn of events within an ordinary day holds a powerful, irresistible allure for her.