Daigo Shigeno, whose father is a professional baseball player who was also active in the major leagues, is in the second year of junior high school. He goes to a private school with Mutsuko Sakura, a childhood friend and teammate from the boys' baseball era. Daigo and Mutsuko belong to the baseball club, but there are only 6 members, and 4 including Mutsuko are girls. In April, when the new first grader is greeted, captain Daigo is eager to recruit new students to make up for the shortage of members. Around that time, at the entrance ceremony, first-year sports-recommended students were all in line ...