During the Roaring 20s era in America, the aftermath of the Great War brought a sense of peace and positivity, at least on the surface. However, there were ominous elements lurking in the shadows, waiting to disrupt this tranquility. Sister Rosette Christopher, an exorcist affiliated with the Magdala Order, has the responsibility of combating demons that wreak havoc. Ironically, she and her partner Chrono, often inflict more damage than the very beings they fight against. During their latest mission, they encounter Azmaria, a talented young girl under threat from her malevolent stepfather. As Rosette and Chrono endeavor to rescue her, their own relationship is further unveiled. Beyond their initial facade, there is more to these two characters than meets the eye.