Single Minako Ohba (Tanaka Yuko) works as a cashier in a supermarket, has a milk delivery job in the morning, and enjoys the piles of books at home in the evening. Minako delivers milk to the homes of Toshiko and her junior high school classmate Takanari Koto (Kishibe Kazutoku) every morning. One day, Koto's wife Yoko accidentally learned that it was Minako who delivered milk to their home every morning, and learned about her husband's past. She met with Minako to entrust her with the funeral. Koto and Minako were lovers in junior high school, and they often dated in bookstores at that time. At that time, Minako's mother and Koto's father were in love, and they both died in an accident. They broke off their relationship because of their parents' affairs. Later, Koto got married, and Minako was alone. More than 30 years have passed, and although the two live in the same city, they have no contact. After Yoko's death, Koto and Minako were able to get together, but...