Is Gunnm hentai?
English title: Battle Angel Alita
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 1993 · 2 episodes · R+ - Mild Nudity
Drama, Mecha, Sci-Fi, Seinen
Doc Ido, a doctor and mechanic who lives and works in the hellish, postapocalyptic "Scrapyard," finds the—miraculously preserved—remains of a female cyborg in a junk heap. After he revives and rebuilds her, the preternaturally strong, amnesiac "Gally" begins to forge a life for herself in a world where every day can bring a fight for life. The 1993 Gunnm anime adapts the first two volumes of the Gunnm manga.
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