Kanna is a mother who lives with her husband and her puberty-aged son. One day, her husband goes on a business trip, and mother and son begin to live alone. With his father gone, the son begins to depend on Kanna relentlessly. Kanna accepts her son, and the mother-son bond naturally escalates. "Are you curious about Mommy's body?"Kanna asks gently, leading her confused son's hard, erect penis to ejaculation. She then teaches him how the female genitals work, and finally how to have a baby... During the few days her husband is away, Kanna gives her son a sex education as a special sex instructor.