Baba Koichi (49) is the head of the design department at a construction company and has just transferred to Tokyo from Kagoshima. He has little regard for his family and constantly quarrels with his wife and daughter. At work, he acts selfishly and is viewed with contempt by those around him. One day, Koichi is diagnosed with Parkinson's disease, but he cannot accept it and is left alone. On the recommendation of his doctor, Koichi starts attending PD SMILE, a rehabilitation facility for Parkinson's disease. However, being an introvert, Koichi struggles to communicate with his peers at the facility