"Doctor, my emotions seem to be a bit off." "There's a clown at the West City Circus who can make everyone laugh. I think he can definitely help you." "But, doctor, I am that clown." "" This is a fantastical world after a great disaster, where the land is shrouded in mist, hiding countless ancient underground cities beneath. These underground cities are filled with traps, monsters, dimensional spaces, and the forbidden ancient gods and countless treasures left by the old world. The world is marked by calamity, steam, curse patterns, ancient relics, and a sequence of poker cards with extraordinary magical power. The remnants of the old world, the ancient relic containment facility, the poker monks, the witches' assembly, the fire thieves, and the world's wall all play a role. In the shadowy corners of the world, a treasure hunter wearing a clown mask walks alone in the darkness.