Is Gambo hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Movie · 2013 · 1 episodes · R - 17+ (violence & profanity)
Action, Historical, Mythology, Supernatural
Gambo is about a battle between a creature who's been killing members of a royal Japanese family, and a mysterious white bear who protects them. (Source: Crunchyroll)
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