Tsubasa RESERVoir CHRoNiCLE

The story starts off with a girl being hit with a mysterious beam on her head. Inside the shrine, Keefer goes in a saves her from the Guardian of the shrine. The group enters the world, Storm Country, in the middle of a tournament in order to see who is the strongest. Syaoran eventually wins the match. But Keefer needs that sacred object that Syaoran won from the tournament. They both fight to see who gets it, ending with Syaoran giving the sacred object to save the girl.