Aikatsu Stars! features the protagonist Yume Nijino. Yume aims to become a top idol, and she enrolls in the Yotsuboshi Gakuen. 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. (Source: Anime News Network, edited)

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Yume Nijino is in a pinch!?
A luxury school idol cruise liner called Venus Ark has suddenly appeared!
And the perfect idol who leads this ship is "Elza Forte"!!
While traveling around the world, she gathered the most excellent idols and brands she could find.
And now she has set her eyes on her next target, Yume Nijino of Four Star Academy. 

(Source: Aikatsu Stars! Wiki)

Raki Kiseki is a second-year middle school student who transfers to Star Harmony Academy to become an idol. However, when she uses an Aikatsu Pass she received from her big sister (an Aikatsu engineer), something mysterious happens. Lots of doors appeared before her, and when she opens them, she meets Aikatsu idols she never knew before, such as Yume Nijino. Raki vows to design her own premium dress and perform in it on stage. (Source: Anime News Network)

Subaru Yuuki