 If you liked
Yokohama Kaidashi Kikou
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 ...then you might like
Kaze no Tani no Nausicaä
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Even if they belong to different genres, Nausicaä is centered around action (Hayao Miyazaki style mind you), and YKK is a slice of life meditation, they both share the same post apocalyptic theme about how to deal with the humanities dark sides. Both are incredible masterpieces that I can not recommend enough.