The record of Reiko (44), a married woman, opening the forbidden door as she faces the end of her life. Eight years into marriage, no children. Shy by nature and insecure about her appearance since adolescence, she had zero romantic experience until her mid-thirties. After marriage, though longing to conceive, her intimate life with her husband gradually faded. Then one day, she discovered an AV he had been hiding, shattering her pride as a woman. Determined to reclaim her worth, she resolved to bare her body. That impulse led her into a whirlwind of sexual experiences, transforming her completely. The first part covers her journey into her first affair, a cuckold scheme carried out with her husband's cooperation, a wild drinking party at a rented villa, and even a day trip where she received lesbian initiation from another woman. Here begins a shocking story where a woman's dignity and desire collide.