You play as a hero, whose job title is called, Diseviled, name for those that for experts at hunting down and dealing anything that involves demons. But you have to feed and support yourself, so you charge fees or salaries for your service. This time you have been hired by a group of wizards that want you to retrieve a black book in the basement of a castle, heavy guarded by demons. Will you be able to finish the job and collect the payment or die trying?