Reborn as the Morrow family’s eldest son, Demon King Kain’s power is sealed in his blood, unlockable only by voluntary sacrifice from his birth father and half‑sister. To gain status, his family signs a blood‑sacrifice pact and delivers him to noble heir Lucius, who covets Kain’s demon‑king blood and heart to revive the Demon King’s Crown.
Kain awakens his true power at the altar. With maid Leah and demon general Agareth, he exposes the conspiracy, braves deadly trials and saves Leah and the city. Lucius is dragged into the abyss by pact backlash for seizing the crown, while the Morrows face justice. Kain abolishes live‑sacrifice rites, traveling between the abyss and mortal world to rebuild with survivors.
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