One of the Hachiyō, he is the Genbu of Earth (地の玄武?). Yasuaki is an Onmyōji, and a disciple to the famous, historical Onmyōji Abe no Seimei. He is cold and analytical. Because he is an artificial human created by Abe no Seimei, Yasuaki lacks human emotions. His elemental attribute is Mountain, and his dragon jewel is located beneath his right eye.