Rhys is the right-hand man for the devil, he is in charge of keeping all the other devils in line. One of the devils foolishly left their guide behind in the human world, Rhys has to recover this book by disguising himself as a human. Unfortunately for him, you encounter this book and read through it however since you have read it, Rhys now has to grant your wish inorder to possess your soul to keep the devil's world safe.