In a world where all natural forces - such as heat, light, and motion - are controlled by invisible winged creatures known as vox, mages have successfully conquered death, making all humans immortal.
By chance, a journalist named Liiran discovers a winged woman sleeping in a glass coffin, buried in a long-abandoned facility in the desert. The woman, Mortis, is the vox of death.
She escapes her prison, but with no memory of what she is, Mortis goes to the only person she remembers - Liiran.
Declared a criminal merely by his knowledge of Mortis' existence, and nearly arrested for treason, Liiran learns that his government is controlled by mages and a corrupt vox bent on taking over the world. He and Mortis are forced to flee, and are drawn into the chaos of war, meeting an enslaved vox, an independent journalist, and a pair of beautiful assassins as they fight to rescue Mortis' friends and avoid imprisonment.
Meanwhile, Liiran struggles with his confusing love for the living personification of death - and the fundamental questions of what it really means to live.