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

Movie · 2008 · 1 episodes · PG-13 - Teens 13 or older
Adventure, Comedy, Fantasy, Horror, School, Seinen
Amagane Rinne had an accident and died while hurrying to school. She suddenly arrived in an awkward school... in Hell, filled with demons. While she is struggling and wishing to go back to the world whence she came from, she makes friends with her demon schoolmates and develops an uncommon bond.
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