America in the Roaring 20s. On the surface, it's a positive, peaceful time after the violence of the Great War. But lurking in the shadows is a dark element ready to snatch that peace away. Sister Rosette Christopher, an exorcist working as a part of the Magdala Order, has a duty to fight the demons which appear and cause destruction. But along with her companion Chrono, she usually ends up causing more destruction than the demons themselves! On one particular mission, they meet a young girl with a beautiful voice named Azmaria, who is being targeted by her own stepfather. As Rosette and Chrno work to save her, more is revealed about the relationship between them. There is more to these two than meets the eye.

How Sister Rosette and Chrno became a team! This volume begins with a flashback to the childhood of Sister Rosette and how she and her brother Joshua met the demon Chrno. Joshua, blessed with the gift of healing, joins the Magdalan order. A demon named Aion tempts Chrno with the gift of a horn which will give him back his demonic power. Chrno refuses, and the horn is given to Joshua-who begins to grow more and more demonic! This prompts Rosette to make her contact with Chrno so that Chrno will have enough power to fight Aion and possibly save Joshua. Back in the present, a demon possesses the angel Azmaria. Getting rid of the possession forces her to summon so much power that her wings come back.

Sister Rosette and company are about to embark on a mission to find Rosette's long-lost brother, who was last seen sporting the horns of a demon. But their journey might end before they leave the bright lights of the city. A powerful witch who threatens the gun-toting Sister is on a search of her own, and she is thirsty for revenge. A good ol' exorcism won't stop the wicked woman, nor will it rid this evil-crushing team of the sneaky spider-woman called the Puppet Master. The Magdalan Order's finest put their demon-slaying talents aside, only to be confronted head-on with the chilling face of devilry!

It's America in the roaring '20s, and gun-toting Sister Rosette Christopher is off to Chicago to exorcise some more demons, but her demon sidekick, Chrono, is keeping a secret that could cost them their lives. Teen.

The toughest nun of New York City has finally found her brother, but their reunion is anything but happy. He's under the sway of the demon Aion, who seeks vengeance upon his old buddy Chrono. In his true demon form, Chrono is up to the evil-stomping action, but our nun with the gun is left too weak to even pull the trigger. Rosette will have to call for a miracle - or at least some back-up!

Rosette is without her partner-in-crime-fighting, and to get him back she'll have to risk her own sacred soul by diving into Chrono's otherworldly spirit. She'll leave her tommy-gun behind and plunge deep into Chrono's memories, but the story that unfolds in the dark pockets of his mind will test Rosette's faith in demons!

Chrono and Rosette infiltrate Eden, the stronghold of the Sinners, in order to rescue both Joshua and Azmaria. Little do they know that pursuers from Pandaemonium have finally caught up with Aion, and when they launch an offensive of their own, all hell is going to break loose!

Pandaemonium is dying... and with her passing, the earth is faced with the greatest threat ever, as Aion's age-old vendetta nears fruition... Only Rosette and Chrno stand between him and the world's annihilation! However, the odds are heavily stacked against them, for, the duo is up against the toughest enemy of all - time. Although the Apostles turn around and aid the two crusaders, it might be too late. Whatever the result of this conflict, one thing is guaranteed: There will be no winners, only survivors. And so, the roller coaster tale of a headstrong nun and her gallant demon companion comes to a bitter, tragic - yet strangely soothing - conclusion...