Several years later in the far east in a setting similar to that of the Sengoku era Japan. It is ruled by the King of the Underworld and its people have become spirits who can only appear during the night. At the same time, there are those who fight that is not influenced by the King of the Underworld.
You become an employee of a company that manages Undernaughts hired by illegal means. You are tasked with leading your employees through a labyrinth that you become trapped in by the "Mad King". Players will utilize the "Switch Boost" power to challenge "monsters" named "Yomi", as well as the "Yomi no Hana" ability to clear paths forward and return to the surface alive.