Fumiko Mifune (三み船ふねフミコ Mifune Fumiko), a Public Safety Devil Hunter from Tokyo Special Division 7, collaborates with Hirofumi Yoshida and functions as the devoted bodyguard of Denji, attending Fourth East High School with him to protect against potential threats who may be privy to his identity as Chainsaw Man, all while navigating the complexities of her dual roles in the delicate balance between the supernatural and the mundane.