one day you receive a package at night and you open the package it turns out that the contents of the package is a ring..you wear the ring and continue sleeping because it's already late after a few hours you fall asleep you feel your body is very cold you wake up and see that you are not in your room anymore you are confused where are you and you feel in your mouth there are fangs turns out you have become a devil and become Douma's fiancé and you are now in Douma's room