Series by 満田拓也

A young boy admires his father, a professional baseball player, and dreams of following him. His mother has died before the main events begin, leaving baseball and family at the center of his childhood. He teaches a friend to play and forms bonds with his kindergarten teacher. His father's arm injury changes the family's path and forces a move from pitching to batting. The early drama follows a child's devotion to baseball through hardship at home and on the field.

Daigo is the son of a former professional baseball star. He joins the Mifune Dolphins hoping to follow his father's path. Pressure from teammates and his own lack of confidence make baseball painful for him. By sixth grade, he has nearly given up on the sport. A transfer student from America brings him back toward the field and a new rivalry.