 If you liked
Kaze wo Mita Shounen
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 ...then you might like
Haha wo Tazunete Sanzenri
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It's not so much about the similarity of story line or characters as it is a commonality of look and feel. I really think if you like 3000 Leagues In Search of Mother (aka Marco, From the Apennines to the Andes) you will enjoy the time you spend on the movie The Boy Who Saw the Wind.