In the aftermath of Seraph of the End: Catastrophe at Sixteen, Guren Ichinose defies a forbidden rule by resurrecting his friends, plunging humanity into chaos. With only demons and children left alive, they face monstrous threats from vampires. United by hope, the survivors strive to rebuild their shattered world. Consumed by guilt and isolation, Guren embarks on a solitary quest through the devastated realm he inadvertently wrecked. Amidst uncertainty, he grapples with his identity - torn between his humanity and demonic nature, questioning if he is a redeemer or a harbinger of death.