In the modern world, catacombs have descended, and countless monsters have emerged from the catacombs. Humans have managed to eliminate the invading monsters with the help of modern weapons. Humanity counterattacked the caves and found that modern weapons could not be used in the caves. Fortunately, the cave produces an awakening stone. The awakening stone can enable ordinary people to awaken their fighting souls. The fighting souls are divided into soldier souls and general souls. Those who awaken their fighting souls can practice combat skills. From then on, humans have the possibility of counterattacking the caves.
