Is Cobra The Animation: Time Drive hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2009 · 2 episodes · R+ - Mild Nudity
Action, Adult Cast, Adventure, Sci-Fi, Shounen, Space
Lady has disappeared so Cobra must dive into her past to save her. This is the story of who Lady used to be and how she got that metal body.
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