
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.
A new school year begins with Yume now a fully-fledged S4 member alongside Ako, Mahiru, and Yuzu. As Yume launches her new brand, Berry Parfait, Ako is shocked to learn that the brand she was hoping to pair up with, Fuwafuwa Dream, has instead announced a contract with Kirara Hanazono, an idol from the ship-based idol school Venus Ark.
As the threat of Venus Ark looms over the school, Yume and Rola decide to put on a show for the first year students.