The fourth season of Aikatsu! continues on from season 3 with an introduction a brand-new idol unit from Hokkaido.

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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)

An event turned into a movie, with our director being Ichigo Hoshimiya and our main heroine being the idol who just became the Starlight Queen, Akari Oozora!
A slapstick story about finding that one Aikatsu! Card.
The final stage of the 25 idols.

One day, top designer Tsubasa Sena is suddenly visited by a rich girl Tsubaki, who expects him to design an exclusive dress for her at any price. However, Tsubasa refuses her with the reason "premium dress are only for idols". To achieve her goal, Tsubaki decides to transfer to the top idol school, Starlight Academy to become a real top idol and impress Tsubasa... 
 
Aikatsu! GO! GO! GO! is the last "arc" of Ciao's manga serialization of Aikatsu!. This arc features the manga original character Tsubaki Saionji. 
 
(Source: Aikatsu! Wikia)