Momoko (Arimura), 27, works at a big home center in the suburb of Tokyo. She lost her parents when she was 18, and decided to work to raise 3 younger brothers on her own instead of going to college.Momoko is appointed by her boss to take charge of the Christmas decoration of the store. It's a big event for the whole store staffs and a big challenge for Momoko. In a meeting about the decoration, Momoko meets Manato(Hayashi). He is humble and hard-working, always smiling. Since Manato is working night shifts, Momoko can meet him only for a very short time, but she falls in love with him. Manato is very kind to Momoko, but it seems to her that there are walls between them.