Is Karneval hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · PG-13 - Teens 13 or older
Fantasy, Josei, Sci-Fi
DVD bundled with the limited edition of the 10th volume of the manga, previewing the upcoming TV anime and including footage that will not be used in the series.
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