 If you liked
Momo e no Tegami
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 ...then you might like
Yoake Tsugeru Lu no Uta
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Both are movie's whose stories in plot synopsis and set up sound very like a ghibli film, but then have distinctive animation styles that are associated with their respective directors. Amusingly Momo's director is known for his realistic rotoscoped style, while Lu's director is know for his exaggerated colorful style.
The main character in both in a gloomy kid who has moved a small seaside town from the city and then has an experience with yokai.