 If you liked
Sen to Chihiro no Kamikakushi
|
 ...then you might like
Karigurashi no Arrietty
|
Both movies involve the main character being put into an unfamiliar situation and their experiences within said situation.
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Recommended by TheManiacalGamer
Both are by Studio Ghibli. Both are about characters who are the same age and contain fantastical ideas.
Studio ghibli flavour
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Recommended by dontdowndone