Is Aikatsu Stars! Movie hentai?
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

Movie · 2016 · 1 episodes · PG - Children
Idols (Female), Music, School, Slice of Life
The film's plot is set in a southern island, where a Legendary Dress Audition is taking place. Nijino Yume and the others must find secret dresses said to be hidden somewhere in the island. (Source: ANN)
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