Is Gregory Horror Show hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 1999 · 25 episodes · PG-13 - Teens 13 or older
Comedy, Horror, Mystery, Mythology, Supernatural
The first series is a set of 25 stories about a male businessman arriving at the hotel after taking a train home from work. He encounters the mysterious owner of the hotel, an old mouse known as Gregory, who suggests that he stay a while. Soon, the man becomes drawn into a bizarre series of events taking place within Gregory House as he tries desperately to escape from this bizarre purgatory. (Source: Wikipedia)
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