Asumi, who divorced her husband ten years ago, raised Taichi single-handedly. Because she was from a motherless family, she worked hard not to make people feel sorry for her. Before he knew it, Taichi had graduated from university and got a job offer at a printing company. Thinking that raising a child had come to an end, it felt like a hole had opened in his heart. When he felt lonely, he asked Taichi to take a trip to the hot springs, saying that he wanted to take a break from his work once in a while and relax. Asumi and Taichi left for a graduation trip alone.
