Highschool student, Emma, after witnessing a paranormal activity, has to die. Her only protection was to be held captive and enslaved by a handsome demon to be able to gain superhuman abilities but she has to be his prisoner for her entire life and ending her captor's life is the only escape. As time goes by, they start to catch feelings for each other but it is deemed forbidden to falling in love with a human. How will they keep their love against all odds?