After meeting a young girl playing basketball in the park, Komachi Satonaka looks into the girl's favorite light novel, Mini Basket!, which her friends are slowly forgetting about due to the virus. Komachi goes with Saori Rokugou and Rei Kurushima into the world of Mini Basket!, where Maya, who wants to get rid of all the young girls in the series, challenges them to a game of basketball. Receiving coaching from the novel's protagonist, the girls face off Maya's team of viruses. After Maya's attempt at cheating at the last minute results in the game being rendered void, the girls defeat the virus normally.