Is ChäoS;Child Episode 0 hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 1 episodes · R - 17+ (violence & profanity)
Mystery, Psychological, Sci-Fi, Supernatural
A recap of ChäoS;HEAd that aired along with episode 1 of ChäoS;Child as part of a one-hour special.
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