Yume Nijino aims to become a top idol, and she enrolls in the Yotsuboshi Gakuen (Four Stars Academy). This academy has a special group called the S4, who are the top four active idols in the school. Yume and the other first-year students aim to become a part of the S4.

Miyu Tomitaas Yume Nijino (voice)
Ayaka Asaias Rola Sakuraba (voice)
Natsumi Murakamias Ako Saotome (voice)
Yume Miyamotoas Mahiru Kasumi (voice)
Minami Tsudaas Hime Shiratori (voice)
Sumire Morohoshias Tsubasa Kisaragi (voice)
Azusa Tadokoroas Yuzu Nikaidou (voice)
Ayaka Ohashias Yozora Kasumi (voice)
Reina Uedaas Lily Shirogane (voice)
Megumi Yamaguchias Koharu Nanakura (voice)