Subaru Hasegawa dreams of basketball stardom, but his high school club at Nanashiba High is suspended for a year after a scandal involving its captain and the coach's young daughter. Shaken, he decides to walk away from the sport. Then his aunt, Mihoshi Takamura, asks him to coach the girls' basketball club at Keishin Academy, made up of five sixth-graders. Reluctant at first, Subaru comes to learn the girls' complicated circumstances and commits himself to training them, aiming to beat every strong opponent they face. The show is a comedy sports story with ecchi elements, based on a light novel series by Sagu Aoyama.