Tsubaki divorced her husband 14 years ago, and her two children were her older brother and her husband's younger brother. Eventually, the children grew up, the older child got a job and left home, and the younger child came to Tsubaki's house to replace them. Perhaps because she was raised by her strict father, she invited her son to take a trip to the hot springs during the consecutive holidays in order to make her son feel even a little affection for her. However, the inn was a fateful inn for Tsubaki...
