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 Tomita
• Ayaka Asai
• Natsumi Murakami
• Yume Miyamoto
• Minami Tsuda
• Sumire Morohoshi
• Azusa Tadokoro
• Ayaka Ohashi