Before joining the Real Japan 11, Yuji Soga was a player of Gosato Industries' OB. He aimed to be a pro, therefore, during a training match with J2's Omiya Ardija, he played as a one top forward, hoping to draw the attention of the Ardija staff. His headers threaten the goal of Ardija many times, but he also missed numerous play. Therefore, he didn't make it into the J-League. However, Minato Gamo noticed his hidden talent and persuaded him to change into a defender. He performed very well in the new position, and even managed to win during hard fought duels against Ryoma Hino. However he still felt that his abilities were insufficient and decided to go to Brazil. He promised that after he became able to stop the Brazilian technicians, he would return.