Humanity once ruled the Earth. Now, it is nothing but prey.

When an otherworldly catastrophe tears reality apart, humanity is dragged into the Overworld—a realm where savage beasts, ancient powers, and deadly trials await. Entire cities vanish overnight, leaving behind only ruins and despair.

Joon Ho, a determined yet ordinary youth, awakens in this chaos with nothing but his will to survive. But survival here is no simple task—the Overworld rewards the strong and devours the weak. Alongside warriors like Blaze, whose spirit burns as fiercely as her name, Joon Ho must carve a path through endless horrors and uncover the truth of why humanity was cast into this nightmare.

As allies rise, enemies betray, and hidden powers awaken, one truth becomes clear:
In the Overworld, to stand still is to die. To climb higher is the only way to live.