The setting is a virtual network game called Noah's Ark (ノアズ・アーク?). Dungeons are automatically generated so the structure changes upon each entry. By accessing treasure chests on each floor, players can acquire items to boost their abilities, restore their health, and do things like seal enemy demon movement. Combat is turn-based. Players can use weapons like swords for melee attacks, guns for ranged attacks, and magic for spell attacks. Series staples such as demon negotiation and demon fusion are also possible. Floors can be either regular, boss, or rest floors, where players can fuse or store items, but it is possible to use teleport stones to return to terminals at any time. When a player dies, they will lose all items and demons with them, but their level will be unchanged. In demon n