Is Carnival Phantasm: HibiChika Special hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2012 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Supernatural
A new episode of Carnival Phantasm released on the Type-moon Fes - 10th Anniversary Event - Blu-ray.
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