Yûko Satô

Several hundred years in the future, the resources of the Earth runs out, and the progression of the human race has stagnated. The world is now divided into "Units". A boy named Hajiki Sanada lives with his mother and sister in Unit 74, in a place called "Night Town", in which all electricity is shut down at midnight. The key in this story is an object called the GAD. GADs have the ability to reconstruct materials while reacting to feelings of an organic life. (myanimelist.net)

A battle is about to begin in Tokyo: the Shaman Fight, a tournament held every five hundred years where shaman--those who can command spirits--confront each other in combat. The victor of this contest becomes the Shaman King and the only one who is able to contact and control the Great Spirit, allowing them to reshape the world as they please through its immense power. (myanimelist.net)