The baseball team from Karugamo High School is struggling, having suffered a major loss to the Eagles. As a result, several players quit and the team is left with only eight members, one short of the required number to play a game. Desperate to help the team, Harumaki Shunpei goes against his beliefs and decides to purchase a baseball robot. However, due to financial constraints, he ends up buying a maid robot named Azusa instead. While Azusa is determined and compassionate, she seems no match for the elite baseball robots she will be facing on the field. Yet the team's only hope for success hinges on a mysterious secret from Azusa's clouded past.