Is Maken-Ki! Specials hentai?
English title: Maken-Ki! Secret Training
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 6 episodes · R+ - Mild Nudity
Ecchi, Shounen, Sports
Each of the six volumes of the Maken-Ki! Blu-rays will carry a 10 minute long short anime "Doki Doki! Maken-ki! Himitsu no Kunren". Secret trainings with the main characters will be animated.
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