Is Garouden: The Way of the Lone Wolf hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

ONA · 2024 · 8 episodes · R - 17+ (violence & profanity)
Action, Martial Arts
On the run from his troubled past, Juuzou is forced into competing in a deadly underground fighting tournament. Skilled in the respected martial art Takemiya-ryuu, Juuzou must navigate a path filled with formidable foes and his personal demons — all while dealing with a bounty of three million yen on his head and a detective on his trail. (Source: Netflix, edited)
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