 If you liked
Planetes
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 ...then you might like
Kurau Phantom Memory
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Both series lean towards a more realistic take on sci-fi, not just in terms of technology but in sociology as well; Kurau does tend to bend the rules but still manages to feel like it's within the bounds of the possible. The two are quite similar in the actual style and quality of their animation (Kurau being amongst BONES's catalog). Ultimately both are sci-fi dramas with heavy emphasis on slice-of-life type elements and character development.