I Can Easily Defeat SSS Ranks... This World Is Already Mine Novel

The world has fallen into decline as birth rates plummet and hope fades. Every person on Earth receives a mysterious email containing The Aegis Mandate, triggering The Incident of Separation—a global psychic catastrophe that erases identities and divides survivors into three factions: Law, Neutral, and Chaos. Cities transform into battlegrounds, apartments become dungeons, and ordinary people turn into monsters or hunters. Ragnar Vhagar, a solitary university student, unexpectedly becomes a Demon King through a system he never wanted. Trapped in his crumbling apartment with goblins and a soul crystal, his mission is to build a domain, defend it from invading Heroes, and survive by leveling up quickly. Isabelle Thorne, a skilled warrior, joins him reluctantly, and their alliance deepens into genuine trust and connection as they ascend through this game-like world. As Ragnar conquers domains and defeats bosses, he uncovers the truth: the dungeons exist to break players, not crown winners. While the Law faction seeks control and Chaos craves destruction, Ragnar pursues something forbidden—freedom. In Kanta's ogre stronghold, Ragnar and his warband claim a kingdom and unify the system, preparing for what lies ahead. The gods stir as Ragnar rewrites the rules themselves.