Is Iron Man: Rise of Technovore hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2013 · 1 episodes · PG-13 - Teens 13 or older
Mecha
The film explores a confrontation between Iron Man and the villainous Ezekiel Stane, who develops new bio-technology that seemingly outclasses the Iron Man armor. After Stane unleashes a terrorist attack and sets Tony Stark up to take the fall, Iron Man must evade S.H.I.E.L.D.'s man hunt and find a way to clear his name. (Source: Marvel)
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