Eleven girls form the C‑class idol group Ongaku Shoujo under Pine Records. Although their sales are red and popularity remains low, Producer Ikebashi and the members work tirelessly to improve every performance. Still, Ikebashi proposes adding a new member who could spark the group"s success and bring fresh energy. Consequently, an audition was announced, leading to the future legendary unit meeting a talented girl named Hanako, who might become their pivotal catalyst. And the industry at large for hope.