Is Kaidan Restaurant hentai?
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

TV · 2009 · 23 episodes · PG - Children
Horror, Kids, Mystery, Supernatural
TV Asahi announced a new kids anime "Kaidan Restaurant (Thriller Restaurant)" based on a picture book. Each episode will consist of three stories or "dishes": the appetizer, the main dish, and dessert. The first two "dishes" will deal with an ordinary sixth-grade schoolgirl named Ako Ozara and the bizarre occurrences that befall her classmates. The third "dish" will be a standalone short ghost story told by Ako and her friends.
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