Is Akuma no Riddle: Shousha wa Dare? Nukiuchi Test hentai?
English title: Riddle Story of Devil: Who's the Winner?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 1 episodes · R - 17+ (violence & profanity)
Action, Comedy, Ecchi, Girls Love
Unaired episode 13 of Akuma no Riddle released with the seventh Blu-ray/DVD volume. The special will be previewed at a screening in Tokyo City on November 22, 2014. The BD/DVD will be released on December 17, 2014.
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