In the wake of losing the two people he cherished most, Kenji finds himself adrift in a world devoid of purpose. Each day, he contemplates surrendering to the abyss, believing that death might be a welcome escape from his grief. But everything changes when mysterious creatures come to the world and unleash chaos upon the world. As he grapples with his desire for oblivion, Kenji discovers an unexpected will to survive. Drawing on the rigorous training instilled in him by his grandfather, he must confront these monstrous foes that threaten his very existence. In a battle for survival, Kenji faces a harrowing choice: adapt to the madness around him or succumb to the darkness he once longed for.