Shigeno Goro (voiced by Morikubo Shotaro) has lived a life of dependence with his father Honda Shigeharu (voiced by Koyasu Takehito) since he was a child. Honda Shigeharu is a professional baseball player. His persistence and passion for baseball deeply influenced the young Goro, making Goro have a strong vision for such a sport. Unfortunately, baseball was a niche sport at that time. Goro finally found Sato Hisaya (voiced by Morita Seiichi) who also liked to play baseball, and the two formed a deep friendship. In an accident, Honda Shigeharu was injured and died on the field. The kind kindergarten teacher Hoshino Momoko (voiced by Noda Junko) adopted Goro. At the age of nine, Goro finally joined the Mifune Dolphins Boys Baseball Team with his own efforts, where he met friends such as Komori Daisuke (voiced by Kugimiya Rie), Shimizu Kaoru (voiced by Sasamoto Yuko) and Sawamura Ryota (voiced by Nojima Hiroshi).