Chika Takami, who describes herself as a normal girl, has never participated in any clubs and possesses no remarkable talents. However, following a trip to Tokyo, she discovers a stage where even an ordinary girl like her could shine: the world of school idols. Inspired by the former superstar school idol group μ's, Chika is determined to establish her own school idol club at Uranohoshi Girl's High School in her seaside hometown. But even before recruiting any students to join the group, the aspiring school idol encounters her greatest obstacle: student council president Dia Kurosawa, who firmly opposes the creation of the club. Just when it seems there is no hope, Chika meets Riko Sakurauchi, a transfer student from Otonokizaka High School, the home of μ's. Somewhat shy but a talented piano player, Chika believes her to be a promising recruit, though convincing her to join is easier said than done. In spite of that, Chika chooses to charge forward and overcome the obstacles keeping her from forming a school idol group that shines as bright as the nine that came before her.