Ash, haunted by memories of his abusive father, is living in the promonster state of Belfort with his wife; Julia, a former human who purposley monsterized herself in order to cure herself of a life-threatening disease. One day, a mysterious man appears and by unknown means turns Julia back into a human. Now Ash, Julia, and their friends in Belfort must find this man so Julia could turn back into a monster girl because if they don't, Julia will die from the same disease that forced her to turn into a monster girl.