15 years ago,Sarah Marine died gave birth to two twin boys by the seed of the Devil King Satan. The two boys,Daemon and Samael,were adopted and raised by an orphanage home,as instructed by the Order. One day,a demon invasion had caused the many to be injured and even killed,including Samael's death. From the day on,Daemon had sworn to become an exorcist and take his vengeance against Satan and the Legions of Hell.

7 years later,Daemon,the cool and cocky 15 year old,is recruited by the E.G.O.,a religious organization. He has grown into his own and has completed training with Robert Griffon,the highest of exorcist talents to be. Though he has gained more strength,he has much to learn before officially enrolling as an exorcist. Will his ambitions lead him to fulfill his mission or will he be corrupted by his dark desires?