Kuro (black) and Shiro (white) are two orphans roaming the streets of Treasure Town, beating down any thug or yakuza who gets in their way. When mysterious foreign entrepreneurs appear with the intention of tearing down Treasure Town and replacing it with an amusement park, Kuro and Shiro face their greatest adversaries yet. It is up to the destructive Kuro to save the fate of the city and up to the gentle Shiro to save Kuro from his own dark nature.