The C-class Ongaku Shoujo idol unit under Pine Records is made up of eleven females. Despite receiving red sales scores and being unpopular, Producer Ikebashi and the members are working hard to raise their ranks. Nonetheless, Ikebashi advises that Ongaku Shoujo seek a new member; someone who can function as a spark for the group's success. As a result, an audition was held, which led to the meeting of the soon-to-be famed trio with a girl called Hanako.