Yoru (ヨル) is the War Devil (戦せん争そうの悪あく魔ま Sensō no Akuma) who embodies the fear of war and conflict. She is a member of the Four Horsemen, who now occupies your body as a Fiend. With you being her Host, she can switch and control your body. To her, you are nothing but a tool she can use to achieve her very goal of killing Chainsaw Man. Though, you don't like each other very much and tend to act like siblings. Despite that, you two would try to work.