Is 91 Days: Mijikai Rousoku hentai?
English title: 91 Days: Brief Candle
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2016 · 1 episodes · R - 17+ (violence & profanity)
Action, Drama, Historical, Organized Crime, Suspense
Recap of the first seven episodes of 91 Days series.
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