Is Queen's Blade OVA hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2011 · 2 episodes · R+ - Mild Nudity
Action, Adventure, Ecchi, Fantasy
OVAs bundled with the Queen's Blade Premium Visual Book and the Queen's Blade Rebellion Premium Visual Book. Both of the episodes will be based on Queen's Blade Rebellion, a sequel to Queen's Blade: Utsukushiki Toushitachi.
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