Is One Punch Man Specials hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 6 episodes · R - 17+ (violence & profanity)
Action, Adult Cast, Comedy, Parody, Seinen, Super Power
Specials included in the Blu-ray and DVD releases of One Punch Man.
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