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

Special · 2014 · 6 episodes · PG-13 - Teens 13 or older
Action, CGDCT, Comedy, School, Shoujo
Short specials bundled with the volumes 1 to 6 of the Blu-ray releases of Sabagebu!
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