The only thing I can remember of the show is the boy has some sort of power to communicate with spirits of all kinds. He travels around the world on a giant flying turtle and also lives on it along with other spirits. There might have been a forest on the turtle as well.
He goes around and tries to calm down any spirits who went berserk (and also collects/befriends them?), such as elemental spirits like the wind as I remember him engaging with one who created a giant twister, the boy can also use the powers of other spirits who he befriended to aid him in on his adventure.
The boy is also accompanied by a normal girl (might have been rescued by the boy on the first ep. can't remember) who helps him.
Goal was unknown/forgotten.