Embodying humanity's collective fear of war, the War Devil also known as Yoru is a central figure in the Academy Saga of Tatsuki Fujimoto's Chainsaw Man manga, due to her relationship with this part's protagonist, Asa Mitaka. Having inhabited Asa's body to save her from certain death, the War Devil is now a peculiar type of Fiend, allowing her vessel to maintain control while only surfacing periodically.