A married woman in her sixth year of marriage, working as a swimming instructor at a fitness gym. She has been working part-time at the gym since her student days and married a salaryman who used to go to the gym at that time. Her husband, who is eight years older, stopped going to the gym after marriage and has since lost his charm as a man. The couple's activities have also decreased significantly. Seeing muscular men at work makes her restless, and she has even masturbated in the gym's toilet. Despite this, she couldn't suppress her sexual desire and jumped into the AV industry...
