Is Gabriel DropOut Specials hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 2 episodes · PG-13 - Teens 13 or older
CGDCT, Comedy, Mythology, School, Shounen, Supernatural
Specials included with the Blu-ray/DVD release of Gabriel DropOut.
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