"AniDB":

Shaman King is about a boy with a shaman power, Asakura Yoh, who wanted to become a king of shaman.

Asakura Yoh might look like a layback Junior High School kid. However, he is a shaman with a special ability to communicate with all the souls and spirits and possess them into his body! Yoh came to Funbari, Tokyo to make friends with all of the powerful ghosts and to become the best Shaman ever.