"The first time I masturbated was when I was in elementary school, so it's been about 30 years (laughs)," says Shiori Maezono, 40. She says that when she started playing with her itch, it felt good, and before she knew it, it had become a daily routine. She didn't know it was called masturbation until she was in middle school. Even after getting married, she continued to do it secretly, hiding it from her husband. She's always had a strong libido, but it increased after she gave birth. Because of her strangely serious personality, she hadn't been able to cheat until she turned 40 and decided to take the plunge and appear in this film. A full-time housewife in her 12th year of marriage and mother of two boys, she exposes her lewd behavior as she continues to fiddle with her clitoris in her first infidelity.