Seven years into her marriage, her days are consumed by housework and childcare, along with a busy schedule as an insurance agent. Lately, she's realized that she's receiving less and less attention as a woman—both at work and at home. Growing increasingly lonely, she began an affair six months ago. On her supposed work breaks—specifically weekday afternoons at the start of each month—she lies to her company and meets a man she connected with through a dating app, beginning a secret relationship. The guilt of betraying her family during her workday, combined with the thrill of secrecy, excites her intensely. Since then, Yumika has been drawn deeper into the world of infidelity. Today, once again at the start of the month, she slips away from the office, heading toward that special, forbidden time awaiting her.