Is Mirai Nikki hentai?
English title: The Future Diary OVA
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 1 episodes · R - 17+ (violence & profanity)
Action, High Stakes Game, Shounen, Supernatural, Survival, Suspense
A short OVA that was bundled with the limited edition of the eleventh volume of the manga.
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