Is K: Seven Stories - The Idol K hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Movie · 2018 · 6 episodes · PG-13 - Teens 13 or older
Comedy, Music, Parody, Showbiz
Shorts featuring the characters reimagined as idols.
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