Keiko is single-minded and does not want her son Tatsuya to feel sorry for her, as she is single-mindedly working hard. This is the end of parenting. The thought made her feel empty, like a gaping hole in her heart. As she loses sight of her goals in life, Tatsuya invites her to a hot spring trip. "I want to go on a graduation trip with my mother who let me go to university." Keiko and Tatsuya set off on a graduation trip just the two of them.
