Tomomi Kiuchi, 52 years old. After over 30 years of marriage, her intimate relationship with her husband ceased following childbirth. Since her husband was her first and only partner, intimacy had always remained a mysterious, unexamined part of her life, and she never questioned it—until one day, attending a long-overdue class reunion changed everything. Seeing her former classmates full of energy and still sexually active, she felt shocked and alienated, unable to keep up with their risqué conversations due to her age. From that moment on, she refused to accept growing old passively and made the bold decision to have her first affair. Her miraculous I-cup extra large breasts become the gateway to a thrilling new world of sensation and desire.