Transfer student Yamaguchi Tsutomu has just joined the baseball team. Yamaguchi is overweight and cannot run very fast, so the coach places him on the "D" team. Unlike the "A" team, which consists entirely of aces, the "D" team is filled with baseball misfits who do not expect to see any playing time. Despite this setback, Yamaguchi is determined not to give up his dream of someday becoming a pro second baseman!