Mitsuko Oyama, a charming 62-year-old grandmother, is an insatiable woman who has slept with around 50 men and absolutely loves sex. She still enjoys masturbating twice a week, and on good days, she can climax three times—through her breasts, clitoris, and vagina. She hates the smell of condoms and the feel of oral sex; she firmly believes that a woman's happiness lies in receiving creampie after unprotected intercourse. Her passionate desire is clearly evident as she takes on the challenge of having sex for the first time in 20 years.