Once upon a time, an angel and a devil fell in love and dared to imagine a world free of bloodshed and war. This was not that world.

On the one hand, Karou is a seventeen-year-old art student in Prague; on the other, errand-girl to a monstrous creature who is the closest thing she has to family. Karou must choose between the safety of her human life and the dangers of a war-ravaged world that may hold the answers she has always sought.

Once Karou finally has the answers she has always sought, a different sort of battle wages on: a battle for redemption. From the streets of Rome to the caves of the Kirin and beyond, humans, chimaera and seraphim will fight, strive, love, and die in this thrilling series.