Season 4 finds Noel and Caron labeled as terrorists—a status that makes everything more complicated. A police officer who calls himself the Demon of Justice appears before them, pursuing an agenda of his own. A young man named Oscar D, driven by personal grievance, begins attacking them with an ability that has no clear explanation. And Jillian, working from somewhere else entirely, moves to protect Noel. Multiple intentions collide, and the girl-and-devil partnership is pulled in directions it did not choose.