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

OVA · 2016 · 2 episodes · R+ - Mild Nudity
Action, Adventure, Ecchi, Fantasy
The story takes place after the wandering warrior Leina's championship has ended. The royal court's magician Alicia uses black magic and opens a doorway to another dimension. From that door, a rabbit lures Alicia into another dimension called Melfairland. Melfairland is holding a tournament of its own to award out a Queen's Blade, and Alicia enters the tournament in order to find a way to return to her own world. (Source: ANN)
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