Momoka Yaohara, a 42-year-old housewife from Itabashi Ward. Married for 18 years and mother of two, she leads a busy daily life. By day, she works as a call center operator for a mail-order company, secretly enjoying prank calls from perverted customers. "I get excited when I have dirty conversations without anyone finding out... not seeing the person makes my imagination run wild and I get wet," she confesses. Though she has sex with her husband twice a week, she admits, "It's just routine. I can orgasm during foreplay, but I've never climaxed during intercourse—that's what I'm dissatisfied with." She's even had an office affair in pursuit of experiencing internal orgasm. Today, highly motivated, she's eager to try aggressive female-top sex for the first time. Will she finally achieve the ultimate deep-vaginal climax her mind craves?