Sayo Ninomiya, a 46-year-old married woman who has been intensely curious about sex since elementary school. Since childhood, she taught herself masturbation techniques and continues practicing them almost daily. Her unique style—using a towel on the floor—is one of her defining traits. Despite her demure appearance, she harbors an intensely lustful side that surprises any sexual partner. Since marriage, she's had affairs with about two men, hinting at her powerful libido. Married for 20 years to a salaryman husband, she decided to appear on camera just before entering her fifties. Her ideal penis is thick and rounded, resembling the 0-series Shinkansen. Despite being a mother to a college-aged son, Sayo captivates with her ladylike charm and uninhibited eroticism. This is the creampie-filled debut documentary of a Milf like no other!