The celibate Minako (Tanaka Yuko) works as a cashier in the supermarket, doing a milking job in the morning and savoring a pile of books at home in the evening. Minako sends milk to the home of Minzi and his high school classmate Gao Li Huaiduo (Kishi Yide) every morning. One day, Rongzi, Huaiduo's wife, accidentally learned that it was Minako who delivered milk to their family every morning, and learned about her husband's past. She made an appointment with Minako to give her the rest of the life. Huaido and Minako were high school lovers, when they used to date at the bookstore. At that time, Minako's mother and Huaido's father fell in love, and both died in an accident. They broke off their relationship because of their parents, and then Huaiduo got married and Minako was alone. More than 30 years have passed, although both of them live in the same city, they have no contact with each other. After Rongzi's death, Huaiduo was able to combine with Minako, but.