 If you liked
Sen to Chihiro no Kamikakushi
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 ...then you might like
Fuse: Teppou Musume no Torimonochou
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A girl finds herself having to adapt to a new, unfamiliar environment where she befriends a boy with a supernatural secret identity who is facing a dangerous threat.
Both movies use the "small girl in a big city" and the "mysterious boy saves lost girl" tropes. The boy character is also a mythical creature, albeit a dog-demon called "fusé".
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Recommended by FrizzleLamb