Even as a young girl, you’ve been able to see the demons that ordinary people can’t. Your parents thought that you were a ‘Child of Hell’ and abandoned you. You were taken in by an orphanage run by the church, where you met a kind man. He became your foster father and you began to live with him in the countryside. Seventeen years later, you find a mysterious book in the basement. It’s filled with strange letters and the last page is gone. You decide to leave it alone. That night, demons appear and attack you and your father. Your father fights back, but he’s no match for the evil creatures. In that moment, three men in black uniforms show up and save you. The demons kidnap your father and disappear. The three men introduce themselves as exorcists, all members of the Crusaders of the Rose. They take you to the church, where the bishop suggests that you become an exorcist and utilize your ability to see demons. The bishop says, “If you help us, we’ll help you find your father.” In order to find your father, you decide to become an exorcist and team up with three mysterious guys. Will you find your father? What’s the secret behind that mysterious book? Who are these guys, and why did they become exorcists? Thus begins a dangerous romance with attractive exorcists!