Is Joker Game: Kuroneko Yoru no Bouken hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 2 episodes · R - 17+ (violence & profanity)
Drama, Historical, Military
Specials included with the Blu-ray box set releases of Joker Game.
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