 If you liked
Suisei no Gargantia
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 ...then you might like
Shuumatsu Nani Shitemasu ka? Isogashii desu ka? Sukutte Moratte Ii desu ka?
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Both shows are set in a post-apocalyptic world world where people live on isolated islands, and the people have an enemy that they must defeat (in SukaSuka it is the beasts; in Gargantia it is the hideaze). Although the themes portrayed are different, both main characters are soldiers living in an environment unlike others living there and struggle with finding what is most important in life.