 If you liked
Sen to Chihiro no Kamikakushi
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 ...then you might like
Kaguya-hime no Monogatari
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Both films by Studio Ghibli have a young girl who at some point in their llifes enter into a very different world they have been living. While Chihiro enters into a god bathouse, Kaguya enters into the ancient aristocracy in Japan.
They both have an old friend who helps them in these different worlds, although for Kaguya is a memory from her rural life.
Both films have a similar emotional scene at its end related with these relationships.
And music by Joe Hisaishi.