Is Classroom☆Crisis: Tabi no Haji wa Uwanuri hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · PG-13 - Teens 13 or older
School, Sci-Fi, Space
Unaired episode included with the third Blu-ray and DVD volume.
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