Is Armitage III: Dual-Matrix hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Movie · 2002 · 1 episodes · R+ - Mild Nudity
Mecha, Sci-Fi
A few years after they first met, Naomi Armitage and Ross Syllabus have started a family. Despite their normal lives, they must keep their identities a secret because many people believe that Robots do not deserve equal status with humans. Ross has an opportunity to abolish these ideas on Earth through a vote, but organizations in the shadows are working so that it doesn't happen. (Source: ANN)
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