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Between the Sea and Sky (edition 2012)
Between the Sea and Sky by Jaclyn Dolamore
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Wikipedia in English
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Esmerine, a mermaid, grows close to her childhood playmate Alander, a winged man, when they join forces to find her sister Dosia, who has reportedly eloped with a human despite the sisters' vow to always keep the sea and its people first in their hearts.
(summary from another edition)