Is Nazo no Kanojo X: Nazo no Natsu Matsuri hentai?
English title: Mysterious Girlfriend X: A Mysterious Summer Festival
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · PG-13 - Teens 13 or older
Ecchi, Mystery, Romance, Seinen
OVA released with the 9th volume of the manga. The day when Tsubaki goes to the summer festival with Ueno, Oka, and Urabe.
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