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

Special · 2012 · 10 episodes · R - 17+ (violence & profanity)
Comedy, Shounen, Supernatural
Unaired "Ura Mirai Nikki" anime (the short episodes of Mur Mur inserted at the end of the main episodes) included in the Mirai Nikki Blu-rays.
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