Is Kenzen Robo Daimidaler Specials hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 6 episodes · R+ - Mild Nudity
Comedy, Ecchi, Mecha, Seinen
Mini-OVA specials bundled with each Blu-ray/DVD volume of Kenzen Robo Daimidaler.
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