The 1920s was a period of profound transformation and turmoil, with horrific demons emerging throughout the United States. To counter this threat, the sacred Order of Magdalene was founded. Its New York division shelters the impulsive and daring Sister Rosette Christopher alongside her companion Chrno. Charged with eradicating demonic dangers, the celebrated squad excels in their duties yet frequently inflicts significant collateral damage during operations.
Both Rosette and Chrno are haunted by grim histories. By vanquishing demons, Rosette seeks her missing brother Joshua, abducted by the sinful demon Aion—a figure who also bears a violent past with Chrno. Together, they must repel the escalating demonic menace and trace its origin while relentlessly pursuing answers to Joshua"s disappearance. The relentless pursuit also reveals hidden alliances among the demonic ranks, forcing them to confront only internal doubts that threaten their everlasting resolve.