40-year-old Shiori Maezono. She first started masturbating when she was in high school, and it's been nearly 30 years since then. It began as simply scratching an itch, but gradually grew into something pleasurable, eventually becoming a daily habit. She didn't even know the term "masturbation" until she reached middle school. Even after marriage, she continued secretly, hiding it from her husband. Naturally possessing a strong sex drive, her desires intensified even further after giving birth. Due to her serious personality, she had never been able to bring herself to cheat—until now. At 40, she's finally decided to live for herself, making her debut in this genre. In her 12th year of marriage, a full-time housewife and mother of two sons, she experiences her first act of infidelity, exposing her lewdness as she continuously rubs her clitoris to climax.