After succumbing to a heart attack, Raizou Takakura awakens in a new realm as the impoverished farmer's third son, Walm. Now a soldier in the war-torn Highserk Empire under siege by neighboring powers, Walm is forced into a life of relentless combat to endure. As the empire gears up for a monumental invasion against Myard and Ferrius, Walm is immersed in a world of bloodshed, grappling with the fragile boundary between life and death amidst the harrowing demise of allies and foes.