 If you liked
Umi Monogatari: Anata ga Ite Kureta Koto
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 ...then you might like
Nagi no Asu kara
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An obvious similarity - sea themes! People from the sea interacting with people of the land, plus their interpersonal relationships.
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Recommended by Valkyrie_Wings
Water plays a large role in both of these series as well as mythology. Both have some level of interaction with character in and outside of the water and the bonds/friendship they may create.
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Recommended by lovelydeath