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

ONA · 2014 · 4 episodes · R - 17+ (violence & profanity)
Comedy, Fantasy, Parody
A collection of animation that highlights the Sickness (increasing stupidity) that is plaguing this generation: Chao You Bing
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