Tekkonkinkreet (2007)

The moon shines benevolently on Treasure Town where small boys can fly. Treasure Town is a futuristic world where life can sometimes be very gentle--and sometimes very cruel. This is particularly true for two small orphaned peasants who are obliged to wander the streets, day in, day out, in search of a way to earn money. Crafty and devious they may be but, underneath it all, Black and White are just two boys struggling to survive in a harsh environment. And life is getting tougher by the minute in this surreal-looking metropolis. Black and White must fight a war if they are to hold on to what used to be the soul of this city--and save themselves.