Rie Takeuchi, heartbroken after her divorce and job loss, finds solace in a trip to the hot springs with her son, Shinichi. Concerned for his weary mother, Shinichi takes her on a relaxing getaway. During their travels, Shinichi begins to see his mother as a woman, confessing his feelings and promising to support her from now on. Overwhelmed by her vulnerability and her son's kindness, Rie succumbs to their burgeoning connection, ultimately leading them into an intimate relationship.