Is Haiyore! Nyaruko-san F hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Parody, Romance, Sci-Fi
A new OVA of the light novel Haiyore! Nyaruko-san, titled Haiyore! Nyaruko-san F, has been green-lit. (Source: MAL News)
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