Is Danganronpa 3: Monokuma Gekijou hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 3 episodes · PG-13 - Teens 13 or older
Comedy, Parody
Danganronpa 3 skits included in the Blu-ray Box Sets.
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