She (Aika) and her high school classmate Shinya got married after 10 years of dating and soon became pregnant. They had a smooth sailing married life. However, during her pregnancy, Shinya is suddenly posted overseas and they decide to separate. After giving birth, she goes there for the first time, but when she meets Shinya again for the first time in a long time, he gives her the cold shoulder. Aika is perplexed by the sudden change in her husband's behaviour. Meanwhile, her husband's colleague, 22-year-old Mona, a local woman, comes to visit her.