Reiko Shiraishi, who has been married for 20 years, still enjoys sex once a week with her husband. However, she has a lustful side that craves more, constantly attracting new men one after another. When tested for sensitivity, she moans, "I'm so sensitive..." and is already dripping wet, even through her panties. As soon as fingers enter her and she receives manual stimulation, she immediately screams, "I'm cumming!" in ecstasy, resulting in a massive, highly erotic squirting session.