Ema, a part-time worker at a convenience store, has a cold relationship with her gambling-addicted husband. Although she feels guilty about the advances of her younger coworker Kuroi, who often shares the same shift, she accepts them out of joy and her daily loneliness. Ema, who is young and full of sexual desire, becomes addicted to passionate extramarital sex with Kuroi, and falls deeper and deeper into the days of carnal desire...