Nagumo is a social studies teacher at Mie Prefectural Koshiyama High School. A former baseball player in college who had to retire due to injury, he worked as a sports trainer before turning to his "other dream" of becoming a teacher at 32. When he is made advisor for the high school's weak and disbanding baseball team, his life begins to come full circle, and strives to produce a miraculous turnaround for the team in this uplifting tale of love and baseball.