Is Marie & Gali hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2009 · 40 episodes · PG-13 - Teens 13 or older
Comedy, Educational
Marika is a gothic lolita who somehow ends up in the mysterious town of Galihabara. There she meets different famous scientists like Galileo Galilei, Marie Skłodowska Curie and Sir Isaac Newton.
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