Ryo, who divorced her husband 10 years ago, raised her son on her own. She worked hard because she didn't want to make her sleepless, and her son went on to graduate school and got a job. While her child-rearing also settled down, Ryo was overcome with a sense of loss. At that time, I was invited to a hot spring trip by her son. Ryo and her son set off on a graduation trip just the two of them...
