After diligently practicing "wall ball," Bungo Ishihama has a fateful encounter with Yukio Noda, a member of Japan's youth baseball national team. The two then advance to middle school and join the ultra-competitive "Seio Senior" team. Aiming for the top of middle school baseball, they engage in fierce battles! As time passes, the duo moves on to high school, setting their sights on achieving "five consecutive Koshien championships," once again striving for the top!