 If you liked
Ilegenes: Kokuyou no Kiseki
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 ...then you might like
Void
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Set in an alternate reality, both manga deal with a society where technological advancements have made it possible for androids/humanoids to exist in perfect harmony. They're so perfect, in fact, that nobody can tell the difference between the two. There's also a thriving black market for these entities. But keep in mind that while Void is an out and out BL manga, Illegenes only has hints of BL. But ah, both manga have *gorgeous* art!