His name like all protagonists can be changed by the player. He is a 14 year old boy who yearns to become the new world champion. Yuuji lives in the East District of Tokyo with his mother and older sister Samantha Kino. As he grew and matured, he would watch his sister play a card game called "Victory Battle", where the player summons monsters from cards. When he witnesses the defeat of his sister by Master Karl, he promises to himself that he will defeat Master Karl to bring peace to Samantha.