Ten years after divorcing her husband, Chitose had been raising Kouta on her own. He successfully got a job at a printing company. However, there was one problem: Kouta's commute took over an hour. Chitose suggested that Kouta live alone, but he refused to leave the house. He didn't go out even on his days off, and Chitose started worrying that he had no friends or girlfriend. To get Kouta out of the house occasionally, Chitose invited him on a hot spring trip.
