Akiyuki is an arrogant teenager with seperated parents living on Sentan island, a small island that is a neutral zone in a war between the Northern and southern governments. While Akiyuki was riding a bus to his high school, he meets a mysterious pale girl who causes the school bus to deonate. After the explosion, a mysterious light appears and enters Akiyuki's body. After coming to the girl's aid, she touches his forehead causing a small gem to appear, creating an organic, white mask. Soon after Akiyuki transforms into an extremely powerful creature called Xam'd.