Is Big Order hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 1 episodes · R+ - Mild Nudity
Action, Shounen, Super Power
The story centers on an introverted high school student named Eiji Hoshimiya with a huge secret—he wished for the destruction of the world when he was younger. Fairies give certain people special powers called Orders, and what Order Users can do with their power depends on their wishes. Ten years after the Great Destruction, Eiji struggles to come to terms with his immense power. (Source: ANN)
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