 If you liked
Black★Rock Shooter (TV)
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 ...then you might like
Aoki Hagane no Arpeggio: Ars Nova
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There're a lot of similarities, like the 3D graphics, the MC's search for identity, and the emotionless personality of the characters. Also, other scenes take place in other worlds as unearthly beings fight each other while humans communicate to them. And, of course, Weapon-action fight scenes!