Is Ai Tenchi Muyou! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2014 · 50 episodes · PG-13 - Teens 13 or older
Comedy, Sci-Fi
The franchise is celebrating its 20th anniversary with this new project. Note: The recap episodes are not included in the main episode count and are now included here.
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