Is Hayate no Gotoku! OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2014 · 3 episodes · PG-13 - Teens 13 or older
Comedy, Harem, Parody, Romance, Shounen
New OVA series of Hayate no Gotoku!, which is part of the manga's 10th anniversary project. One episode each will be bundled with volumes 41 to 43 of the manga.
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