Is Kachou Ouji hentai?
English title: Legend of Black Heaven
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV · 1999 · 13 episodes · R+ - Mild Nudity
Adventure, Comedy, Music, Sci-Fi, Space
Hard Rock Saves Space!! Life can crush your dreams. Ouji is a middle-management drone whose only grip on sanity in the drudgery of his corporate lifestyle, are the few shreds of hope surrounding his past life as the amazing guitarist of Black Heaven, a heavy metal band that almost made it. In his bleakest moment, the magic of performing is restored to him when a beautiful mysterious woman informs him that only his special sound can save the universe from an evil alien invasion. (Source: Geneon Entertainment USA, edited)
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