Is Osomatsu-san: Ouma de Kobanashi hentai?
English title: Osomatsu-san: An Anecdote with Horses
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

TV Special · 2016 · 1 episodes · R - 17+ (violence & profanity)
Adult Cast, Comedy, Gag Humor, Parody, Racing, Sports
Special episode of Osomatsu-san, released as a collaboration with the Japan Racing Association (JRA). The episode consists of multiple short skits surrounding horse racing.
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