After losing her husband, Emiko lives alone with her son, Yoshi. She becomes involved in a secret affair with Tabyuchi, a private tutor who visits their home, and soon finds her body consumed by unbearable desire. Her illicit sex unfolds before her son's friends, and she is drawn into late-night foursomes with Tabyuchi and the boys. Emiko's seductive, ecstasy-filled expressions captivate all who witness them, revealing the irresistible adult lust hidden deep within this forbidden relationship.