Is Rurouni Kenshin: Review Special hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 1997 · 1 episodes · R - 17+ (violence & profanity)
Action, Comedy, Samurai, Shounen
Summary of various fighting scenes of the first half of the series and a brief overview of the Kyoto arc.
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