Chisato Shoda is a married woman whose advances toward her husband are constantly rejected lately, leaving her sexually frustrated and resorting to frequent masturbation. One day, she begins tutoring the son of her husband's coworker, using her experience as a private teacher. Exposed to the young man's defenseless appearance and sweet scent, she becomes aroused, and his penis quickly hardens. Sensing his excitement, Chisato removes her clothes, takes his hand, and guides it to her breasts. Their relationship takes a sudden turn toward forbidden passion.