Is Black★Rock Shooter hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Music · 2008 · 1 episodes · PG-13 - Teens 13 or older
Action, Fantasy, Music
The official music video that eventually spawned the entire Black Rock Shooter franchise. Inspired by the first official illustration by huke, the song was composed by ryo of supercell, illustrated by huke and sung by Hatsune Miku, a VOCALOID.
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