What names would be nice for an anime show but no foreign names though?

I need one about 13 planets and a boy that was sent to the planet of tranquility (peace) because each cursed planet were fighting but every time they fought no one would win so each king had to send one child to the planet of tranquility. each year after the child turns ten a soldier will come to that planet to attempt to kill him. If the child is alive then the child advances. The last two children alive have to fight to the death and whoever wins gets the land of all the planets. But that's not what the main character wants (Leo).