The movie plot orphans Shiro (also called white) and Kuro ( also called black) as they try to protect each other as well as adapt and cope with all the crime and violence that they encounter on the streets of Treasure Town. The boys are different with Kuro having street smarts, common sense and an attitude and Shiro having a highly innocent nature that comes off as slightly stupid but also very sweet. Kuro and Shiro use their talents in an effort to work together to stop a corporation called Kiddy Kastle from tearing down Treasure Town. The twins work together to stop an old man named Yakuza as well as alien assassins from killing them and destroying all of Treasure Town to fit their goals. During their journey (which is set on the moon) they encounter friends as Kimura and his wife, Sawada and gramps just to name a few as well as learn that true friendship can stand up to even the most dangerous villains and that it surpasses race, color and origin. The movie is all about light and darkness and how the boys interact with all the people around them in their quest to adapt to and save their ever-changing world.