Help finding a certain series?

I fell in love with this series in the late 2000's, because it was in Shonen Jump. It's about this boy who gets transported to another world, and he has a charm of a cup and ball, but it becomes a weapon when he needs it. He also gets other charms. Any idea of what I'm talking about? Your help would be greatly appreciated. Edit: Nevermind, found it. Was thinking of MÄR.