20 years ago, Haruka divorced and raised Kojiro by herself. Kojiro safely graduated from university and joined an advertising agency. She thought that child-rearing was finally over... But the advertising agency he joined was an extremely black-hearted company with virtually no days off. Kojiro's physical and mental health deteriorated rapidly. Seeing this, Haruka forced him to take a break and took him on a hot spring trip to change his mood...
