The world's sole remaining, unconquered chasm, the Abyss, is the stage where many adventures are born...and disappear.

Those who appear in these stories are mesmerized by the power of the Abyss and aim for the bottom of the netherworld.

The story about to be told is that of a nameless Cave Raider that begins their adventure many days after Riko and Reg depart for the Abyss.