Is Danchigai: Juusan Goutou Sentou Ikitai!! 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
Iyashikei, Slice of Life
Unaired episode of Danchigai included on the Blu-ray/DVD volume.
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