Reiko who raised her son Hiroaki single-handedly. Hiroaki was a school baseball star player. However, the car that Reiko was driving met with a traffic accident, and Hiroaki, who was in the passenger seat, broke his effective arm. And the way of baseball is cut off. Since then, Hiroaki quit his club activities and quit interacting with people. He didn't go to college, didn't work, and now continues to live like a NEET... On the other hand, Reiko was driven by her own remorse. Reiko thought she would do anything for Hiroaki. And she invited Hiroaki to a hot spring trip because she wanted her to get well even if just a little.
