Chitose Haru, Kumagai Eri, Ryuoh Sarasa, Mukae Kiri, Mukae Uori, Mitsukuri Sasame, Nishio Miku, Yukino Hiyo, Gushiken Shupe, Kintoki Kotoko, and Morooka Roro are the eleven members of "Music Girls," an idol group produced by Pine Records. However, they're a third-rate idol group that can't seem to sell CDs at all. But even though they're obscure and constantly in debt, the members and their producer, Ikebashi, are all trying their hardest. Ikebashi gets the idea that Music Girls needs a new member—an idol who can light a fire under them so that they can grasp success!
Summary taken from: MyAnimeList