Taimanin Yukikaze follows the story of Mizuki Yukikaze, a young anti-demon ninja, who embarks on a perilous mission to rescue her missing mother, Shiranui, deep within the criminal underworld of Yomihara. Disguised as prostitutes alongside her friend Akiyama Rinko, they must infiltrate a dark, demonic organization while struggling with the harsh realities of their undercover roles and the deadly contracts that bind them. Under the guidance of their mentor Asagi, Yukikaze and Rinko face increasing danger and moral challenges as they fight to survive and complete their mission.