In a world where every human's power is displayed as a visible floating Rank above their head, KAI VOSS shows only one thing: NULL. At the bottom of a prestigious Hunter Academy — mocked, ignored, invisible — he scrubs floors and says nothing. But when a catastrophic dungeon fracture swallows the academy's top-ranked students, Kai makes a single, silent choice. And the world learns that NULL doesn't mean zero. It means unmeasurable. Final panel: A masked figure in a black tower activates.