One night, the apocalypse begins. Every human can awaken an ability, while zombies, goblins, and other fantasy creatures flood the world. Kairo, an ordinary college student, awakens an SSS-rank sovereign ability and gains access to a status screen. He must survive, level up, and decide whether to remain a lone wolf or become humanity’s savior, while corrupted survivors and a ruthless government hunt the monsters’ devil items to control their power.