Twenty years ago, Azusa divorced and raised her son Taichi all by herself, successfully seeing him through to graduation from college. After that, Taichi landed a job at a magazine editing production company, and his career was progressing smoothly. However, the company was extremely demanding, allowing him almost no days off, forcing him to work from morning until late at night. Seeing his situation, Azusa grew worried about Taichi, so she made up an excuse about her father's death to help him take time off and invited him on a hot spring trip.