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

TV · 1974 · 56 episodes · PG-13 - Teens 13 or older
Mecha, Sci-Fi, Shounen
A manga comic book and anime television series by manga artist Go Nagai, made as a direct continuation of the successful Mazinger Z series. It was aired on Japan in 1974, immediately following the end of the first Mazinger series.
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