Reiko raised her son, Hiroaki, all by herself. Hiroaki was a star player on the ● school baseball team. However, Reiko's car was involved in a traffic accident while she was driving, and Hiroaki, who was in the passenger seat, broke his dominant arm. Thus, his path to becoming a professional baseball player was cut short. Since then, Hiroaki quit his club activities and stopped interacting with people. He didn't go to college, didn't work, and now lives like a NEET… On the other hand, Reiko was driven by guilt. She would do anything for Hiroaki. Hoping he would cheer up even a little, she invited him on a hot spring trip…
