Is Inferno Cop: Fact Files hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

ONA · 2012 · 12 episodes · R - 17+ (violence & profanity)
Action, Comedy
There are 12 companion pieces in the forms of "Fact Files" (which expand upon a given character from a corresponding episode) airing shortly after each episode.
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