Chiaki Shinomiya has been married for ten years and is frustrated with her husband's low income and stagnant job. To help support the household, she starts working part-time at a convenience store as a morning shift employee. However, during a company drinking party, she's approached by the store manager, Keisuke, and gradually becomes involved in an affair with him. In contrast to her husband's dull and unsatisfying sex life, Keisuke is passionate, obsessive, and enjoys perverted sex, quickly captivating Chiaki with his intense desires. Before long, she becomes addicted to Keisuke's lovemaking and can no longer feel satisfied with her husband. One day, she lies to her husband and goes on a trip with Keisuke, alone.