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

Special · 2014 · 12 episodes · PG-13 - Teens 13 or older
School, Shounen, Slice of Life
Specials included in the Blu-ray/DVD releases.
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