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

OVA · 2010 · 2 episodes · PG-13 - Teens 13 or older
Action, Childcare, Comedy
A Kure-nai OVA featuring new character designs closer to the novel/manga.
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