Miyu has been married for six months. At first, she enjoyed happy days with her husband, but gradually she began to feel lonely and anxious. Her husband was busy with work, coming home late, and they talked less and less, and as their days passed by monotonously, she felt empty. Then, one day, she bumped into her ex-boyfriend in town. As she reminisced about her school days and her youth, the distance between them quickly narrowed, and she made a one-time mistake... While her dissatisfaction with her husband grew, the time she spent with her ex-boyfriend gave her a sense of security, and she felt happy as a woman, and her desire to cheat was ignited...