Belal, High Prince of Hell and Keeper of the Deadly Sin Sloth, is expanding his power by trafficking opium. He revels in the results, and as sloth begins to overtake the mortal realm, all of Hell suffers. The balance of power in Hell, as well as the fate of the Universe, will be decided by a half-demon peasant girl.

Natalia Shura, the daughter of Asmodeus, High Prince of Hell and Keeper of the Deadly Sin Lust, is unaware of the nature of her birth. When her demonic side begins to awaken, her world becomes dominated by dark passions and deadly cravings. Natalia fears she is losing her mind. But her love has been foretold as the only thing that can stop Belal and his allies, and they will do anything to prevent her ascension.

Facing assassins, avenging angels, Hell's deadly politics—and her real father—Natalia must accept the love of more than one man and embrace her demonic heritage as a Princess of Lust. If she doesn't, all that she cares about will be destroyed, and Heaven and Hell will plunge into Chaos.