Izumi Tsubuchi, 50 years old, a full-time housewife. Married for 26 years and mother of three—two sons and one daughter—she enjoys a seemingly perfect life, spending quality time with her family on camping trips. However, her sex life with her husband occurs only once or twice a week. Though he is gentle and kind, his overly mild approach leaves her increasingly unsatisfied. Through social media, she connected with an outdoor enthusiast and secretly experienced a thrilling affair during a camping trip. The adrenaline of having sex in nature, constantly aware of being seen, excited her deeply. Yet, to this day, she has never reached orgasm from intercourse alone—only through the use of a vibrator. Her deepest desire is to experience a clear, vaginal orgasm. As a mother of three, her prominent nipples become intensely erect, stimulated by the taboo thrill and the excitement of infidelity.