The Day I Stared into the Abyss

The earth beneath our feet is not dead. When humans dug through the rock formations, they discovered that terrifying creatures were already entrenched underground. After a short period of calm, they are about to break out of the ground and launch an all-out attack on the human world, turning human civilization into a battlefield. This time, we use flesh and blood as shields and guns as blades to defend the surface and never take a step back!