Is Break Blade: Virgins War hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 1 episodes · R - 17+ (violence & profanity)
Action, Adult Cast
Fight between Nike and Narvi after both lose their Golems. Included in the Blu-ray Box release of the TV series.
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