Is Bikini Warriors Special hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 1 episodes · R+ - Mild Nudity
Comedy, Ecchi, Fantasy, Parody
According to the official Hobby Japan website, an unaired episode of Bikini Warriors will be bundled with the Blu-ray volume to be released on December 9th, 2015. (Source: Hobby Japan)
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