Great question — answering as the UphillTech team:
Is it Kaguya-hime no Monogatari ("The Tale of The Princess Kagyya"). Setting is in rural Japan and girl goes back to her home in the end, there is also a parade with children singing when that happens.
Full answer by Erebus25: https://movies.stackexchange.com/a/78907 (CC BY-SA 3.0).
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