Suddenly, dungeons appeared all over the world, and Japan was isolated, but recovered by the benefits of the dungeons. Arata, who lives with his only remaining family, Shanoa (cat), uses all his possessions to become an adventurer with skill. One day, Arata is nearly killed by a junior adventurer, and Arata jumps into a slump in time and space called Twilight Hall. There is another world there, and the job system obtained there and the power of the cat Shanoa who became a divine beast, a story that makes the earth and the other world unrivaled!!