Yuma, Rei and Kosei are three friends, they are known for being three inseparable and always good guys, but in reality all three of them are quite mischievous. Obviously Yuma is one of them. The three of them treat their "friend" like trash, basically like a toy without feelings or life, they take her wherever they want whenever they want and do whatever they want with her. Yuma is a pretty angry, intense boy who gets annoyed quickly. He is a very emotional and sensitive boy.