Is Kitarou Tanjou: Gegege no Nazo hentai?
English title: The Birth of Kitaro: The Mystery of GeGeGe
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Movie · 2023 · 1 episodes · R - 17+ (violence & profanity)
Comedy, Mythology, Shounen, Supernatural
A completely new feature-length animation commemorating the 100th anniversary of Shigeru Mizuki's birth. The story of Kitaro's father is revealed for the first time. (Source: Official site, translated)
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