Every decade, the kingdoms of man offer a holy sacrifice to the Demon King to prevent war. This time, the sacrifice is Lucien—a pure, devout priest sworn to sacred vows.
He expects to die. Instead, Vaeloth, the Demon King, spares him—and claims him.
"Pray harder, little saint. I want your god to hear you break."
Vaeloth seeks devotion, through fear and obsession. He sees in Lucien the potential for something more than surrender: a holy weapon, a consort, a dark messiah.
Trapped in a palace of shadows, Lucien’s connection to his god falters. Pain becomes foresight, addiction a secret. As war brews, gods stir, and kingdoms fall, Lucien faces a choice: Will he be the world's ultimate saint or its first dark messiah, shaped by sin and sealed by the Demon King's love?
A tale of tainted faith, distorted foes, and love so dangerous it could destroy heaven itself.