Ten years ago, Chitose divorced her husband and raised her son Kota single-handedly. Though Kota recently landed a job at a printing company, his commute takes over an hour, and despite suggestions to move out, he refuses to leave home. He never goes out or socializes, leaving Chitose worried about his lack of friends. Wanting him to experience life beyond their house, she decides to invite him on a hot spring trip to get some fresh air.