Is Youkai Watch! hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

TV · 2019 · 36 episodes · G - All Ages
Comedy, Kids, Mythology, Supernatural
A new season of Youkai Watch focusing on elementary schooler Keita Amano again. The events take place right after the original season; but still chronologically occur before the now complete Shadow Side events as they take place 30 years in the future.
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