Sae Akutsu, a beautiful woman celebrating 18 years of marriage. On the surface, her relationship appears stable—she maintains a weekly intimate routine with her husband. But behind this seemingly harmonious facade lies a shocking truth: their entire married life is merely a cover-up for her affairs. Several years ago, seeking relief from boredom, she tried a dating app and quickly became deeply involved with another man. To this day, she continues to indulge in this passionate extramarital affair, revealing the complex desires of a married woman living a double life.