In his middle school days at Yokota, Koichi Amano was the ace player on his baseball team, leading them to winning the regional championship. He received offers from numerous powerhouse high schools, but he turned them all down and chose to enroll at Kasumi High School in Yokota, a school without a baseball team, as a childhood promise. However, as soon as he put up signs saying "Baseball Club Members wanted", he faced strong opposition from the teachers.