Shinji Ikawa is a dark-haired guy with dark gray eyes, wearing a white jacket, black sweater and black pants, he is Japanese. Shinji gained the power of a red-eyed demon after his witch parents were killed and began to take revenge on the witch hunters by killing them. He was then caught and sent to the Red Thread Prison, gaining a red thread around his arm that blocked his magical powers.Shinji is cunning manipulator who is ready to do anything to get out of prison and continue to take revenge.