Santiago Rackham, a coal miner who has spent most of his life in war, works near the Thorn Wall of Vandal, a highly radioactive area thought to trap those who are destined to cause world destruction. However, years spent working in the coal mines alongside his brother, Matteo Leonidas, took a toll on Matteo’s health, making Santiago constantly afraid of losing him to the point of hating existence and God. One fateful night, Santiago’s life is suddenly ended by Tristan, a mysterious stranger. However, in death, Santiago awakens the power of The Warmonger Monad, an ancient entity that can control war. Now, burdened by this destructive power, Santiago faces a terrifying decision: use his power to break the cycle of war, or succumb to hatred and become a harbinger of destruction—the very thing he has always despised.