Mayumi Sanada, 52 years old. Married for 26 years and mother of three children. Her marital relationship has been absent for years, ever since her last pregnancy, and for the past 20 years she has enjoyed sex outside her marriage. At home, a kind and caring mother; outside, a lustful woman whose true nature she has long kept hidden. But after two decades of infidelity, her affairs have grown stale and routine. The excitement has faded, and she begins to crave something new. "I'm often praised for being great at blowjobs, so I'd love to make an adult actor feel good too," she says, seeking a fresh challenge. After experiencing her first vaginal orgasm, she dives even deeper into the spiral of infidelity.