What does Yuuma want to do on Earth? I want to know what does Yuuma want to do on Earth. Wherever I see it, it's not full episodes so I couldn't see if he knew he was dying, or there are other reasons he came to Japan?
Yuma is a Neighbour form another world.
He comes to Earth (also named otherwise in the multiverse used in World Trigger) searching for a friend of his father.


  as his father gives up his life to save Yuma, granting him a constant trion body and producing a black trigger at the same time, Yuma remembers his father speaking very fondly of a "friend" on Earth, which he helped to turn away other neighbours...