Yamada Tatsuhito is a second-year high school student. He stopped going to school due to bullying. His parents, who have no interest in Yamada Tatsuhito's well-being, have travelled abroad for work. Yamada Tatsuhito is all alone, and he lives alone. One day, he happens to see Ijuin Sho get into a motorcycle accident. Ijuin Sho is the leader of the largest delinquent gang known as Grand Cross. Contrary to his slender physical appearance, he is a strong fighter who has never lost a one-on-one fight. Due to the motorcycle accident, Ijuin Sho is seriously injured. Ijuin Sho also sees Yamada Tatsuhito, who looks just like him. He gets Yamada Tatsuhito to act as his double, but will he be able to survive as a gang leader? ~~ Adapted from the manga series "Densetsu no Kashira Shou" (伝説の頭翔) written by Natsuhara Takeshi (夏原武) and illustrated by Hamori Takashi (刃森尊).