Is Seijuuki Cyguard hentai?
English title: Cybernetics Guardian
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 1989 · 1 episodes · R - 17+ (violence & profanity)
Mecha, Sci-Fi, Supernatural
A freak accident unleashes a demonic spirit within researcher John Stalker - transforming him into Saldo, a mythical cyber-beast fueled by hate and evil. (Source: ANN)
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