Five years ago, Hitomi Honda married a man she met at work. Their marriage had been harmonious, and their life together peaceful—until recently, when she began noticing changes in her husband's behavior, especially regarding his work. One day, she discovered a record of an expensive hotel on her credit card statement, sparking suspicion of his infidelity. When confronted, he refused to reveal the other woman's identity, leaving Hitomi restless and hurt. Later, her husband abruptly left home, claiming a sudden business trip—a rare occurrence that deepened her doubts. Hiring a private investigator, she uncovered the truth: her husband was engaging in paid dating (papa katsu). Betrayed and devastated, Hitomi decided to seek revenge by having an affair of her own.