34-year-old refreshing beauty and housewife, Izumi Yamagishi. At first glance, she has the pure, elegant aura of a professional AV actress, but in reality, she's a mother of one entering her seventh year of marriage. Her relationship with her husband is stable, and life with child-rearing is going smoothly. She never once considered cheating—until gradually, as the frequency of sex with her husband decreased, the uncontrollable lust within her began growing stronger each day. The turning point came during conversations with her mom friends. Hearing them talk openly about their wild sex lives sent her heart racing, stirring for the first time the desire: "I want to cheat too." The sexual curiosity she'd suppressed since marriage, along with the hidden nymphomaniac deep inside, is finally beginning to erupt explosively.