Yūma Kuga/Plot

Neighbor Attack
When he was 6, Yūma's father taught him "The Three Teachings".

When Yuma still lived in the Neighbor world, he and his father, Yuuga, participated in the Neighbor Wars. During one of the battles, Yuugo told Yuma not to partciptate in the battle because earlier that day they had found the dead bodies of some of their men, and they were some of the most powerful of their side. Yuma's father suspected it was the result of the other side having a black trigger. Yuma, however, just pouted and didn't really think much of his father's words. After his father had left to go fight, Yuma left the fortress his side of the war was occupying and went outside into the battlefield. Seeing multiple battles he could help win, he decided to make attacks behind the scenes and eliminate some of the enemy units. But as he went to go do that, he ran into a tall Trion soldier, and wasn't strong enough to defend himself, nearly resulting in his death. As Yuma lay there dying, his father Yuugo came to his aid, and took out his own black trigger. He then sealed the body of the dying Yuma inside the trigger, substituting it with a body made of Trion (which is the reason his hair is white); thus saving Yuma. Unfortunatly, this took all of Yuugo's power. And so he turned to dust, crumbled and died. However, this does not mean Yuma is immortal; Yuma's real body is sealed inside his ring and is slowly degrading. And once his body inside his ring is fully gone, it is most likely Yuma's Trion body will also be terminated.