 If you liked
Simoun
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 ...then you might like
Kujira no Kora wa Sajou ni Utau
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Both anime take place largely on ships (airships in Simoun and sand ships in Children of the Whales) and involve a large cast of characters, some of whom have the ability to use some kind of super power. As the series progress, more is revealed about the characters and the world they live in