Is UQ Holder! Mahou Sensei Negima! 2 OVA hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2017 · 3 episodes · PG-13 - Teens 13 or older
Action, Fantasy, Sci-Fi, Shounen
Bundled with the 14th, 16th, and 17th volumes of the UQ Holder! manga.
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