Twenty years after her divorce, Haruka raised her son, Kojiro, on her own and successfully saw him graduate from college. However, Kojiro became entangled in an extremely toxic work environment at the advertising agency where he was hired, leaving him mentally and physically drained. Worried about his condition, Haruka forcibly took him on vacation and invited him on a hot spring trip to help him recharge. On this journey, will the two of them forge a new kind of relationship?