 If you liked
One Piece Movie 06: Omatsuri Danshaku to Himitsu no Shima
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 ...then you might like
Toki wo Kakeru Shoujo
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Both movies are works of director Mamoru Hosoda and share a similar atmosphere as they both start in a light hearted and funny manner and become more serious in a believable way later. Although they were not produced at the same studio the movies have similar detail reduced artwork and really splendid animation.