1863. As the end of the Bakumatsu period draws closer... A lone Chizuru Yukimura travels from Edo to Kyoto in hopes of searching for her father who mysteriously vanished. As she ventures through the unfamiliar city in the dark of night, she is suddenly attacked by a gang of samurai. Amidst the chaos, a mysterious figure approaches her, hungry for the taste of blood. As the threat of danger approaches, she is saved by none other than the Shinsengumi. After their encounter, Chizuru lives with the men of the Shinsengumi to fulfill their common goal: seeking out her missing father. However, she slowly uncovers the Shinsengumi's dark secret: The Furies. A group of men calling themselves "Demons" eventually confront the Shinsengumi, standing in opposition to their secret Fury identity. Upon meeting these Demons, Chizuru is forced to come face to face with the secrets of her past. This story is about a girl who allies with the men of the Shinsengumi, who are struggling to uphold their faith in an era of rapid social change in Japan.