If you liked
Nagi no Asu kara
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...then you might like
Sayonara no Asa ni Yakusoku no Hana wo Kazarou
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Maybe it's the beautiful settings, the art style, or just the mood, but something about these two feels very familiar to me. (Yes, Mari Okada and PA Works obviously play a part there.) The emotional cores of these two feel quite similar, lots of drama and character focused stories.