At the same time think of "Kikujiro's Summer". Kikujiro took the boy all the way and finally found the boy's mother, only to find that his mother had already had a new home and a new child. He was completely abandoned.
The two movies are actually a bit similar. They are also road movies. In order to satisfy the desires of the younger one, the older one went on the road together to find, lost some, but gained more.
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