Is C³: Rinkan Gakkou Confusion! hentai?
English title: C³ - CubexCursedxCurious - Outdoor School Confusion
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2012 · 1 episodes · PG-13 - Teens 13 or older
Action, Comedy, Ecchi, Harem, School, Supernatural
Unaired episode included with the fifth volume of the Blu-ray. The gang goes on a school trip.
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