Umezawa Rinka lives with her husband Masafumi. They do not have children, and she starts working part-time at Wakaba Bank. As a liaison officer, she goes round to customers and gains the trust of lonely old people like Nago Tamae through her willingness to help with household chores. Among them is Hirabayashi Kozo, a local landowner infatuated with Rinka. One day, Rinka is called to the Hirabayashi household where she meets Hirabayashi’s grandson Kota who has come to borrow money from him. Two years later, Rinka embezzles 100 million yen in cash which she has been holding for customers. She flees abroad and is placed on the wanted list. Okazaki Yuko and Nakajo Aki, who were Rinka’s good friends, meet again at a high school reunion. The two of them talk about the incident Rinka caused. Why would a housewife who lived comfortably with her salaryman husband have needed 100 million yen? It has been reported in the news that it all went to a young man. Unable to believe this, Yuko and Aki recollect the episodes with Rinka as they ruminate about the case and have no choice but to confront the darkness in each of their hearts.
Rika Umezawa (Tomoyo Harada) is a housewife who pursues things that will bring her small happiness in life. Her husband Masabumi (Ken Mitsuishi) holds a stern belief that he will support his wife Rinka. The couple do not have children. Rika begins to work part-time at a bank. She visits her clients' homes. Sometimes, she even helps her elderly clients' with their house chores. This builds a strong level of trust with her clients. One day, she visits client Kojo Hirabayashi's (Mickey Curtis). At his home, she meets his grandchil Kota (Shinnosuke Mitsushima) who came to ask for money. Her encounter with Kota changes her. Soon, Rika embezzles one hundred million yen from her bank and runs away. Two years later, Rika's former high school friends Yuko Okazaki (Maki Mizuno) and Aki Nakaji (Naomi Nishida) trace her embezzlement case and face their own darkness.