Is Gegege no Kitarou (1968) hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

TV · 1968 · 65 episodes · G - All Ages
Comedy, Horror, Shounen, Supernatural
Kitarou, a ghost, spends his afterlife helping humans in need of his skills. He thwarts the plans of evil spirits who live to torment humanity.
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