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

TV · 2011 · 39 episodes · R - 17+ (violence & profanity)
Adult Cast, Drama, Historical, Samurai, Seinen, Visual Arts
The story is set during Japan's Sengoku Jidai (Era of the Warring States) and centers on Furuta Sasuke, a vassal of the great warlord Oda Nobunaga and a man obsessed with tea ceremony and material desires in his pursuit of a fortuitous life. Having learned from Oda and the legendary tea master Sen no Soueki, Furuta walks the way of the Hyouge Mono. (Source: ANN)
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