Otoha Mao, a normal first-year high school student, has a sudden encounter with Hinata Meisa, and thereafter falls into the position of taking over as the top idol Hana in Aikatsu Planet. But at the same time, she needs to keep the fact that she's now Hana a secret! Aikatsu Planet is the story of Mao and her friends doing their idol activities and aiming to become top idols.

Date Kaaya is a Japanese idol and a member from Iginari Tohoku san. She belongs to Stardust Promotion.

(Source: MyDramaList)

Aikatsu Planet! The Movie is the movie adaptation of Aikatsu Planet! series. Screened alongside the movie Aikatsu! 10th STORY: Mirai e no STARWAY. 
Mao Otoha, who is now a second year high school student at Seirei Private High School, is now performing as the top idol Hana in Aikatsu Planet! 

A few months after the Planet Princess Grand Prix, her schedule is packed everyday. The reason why Mao can be an active idol is
because of the bond she has with her fans, in which she has changed and felt touched, and now would like to deliver her gratitude to those important around her by launching the "Aikatsu Planet! Gratitude Festival".