The end of the world... Survive in the ruined world! Due to people's foolish battles, "mutagens" spread throughout the world, polluting many areas and turning them into ruins. Only a worn-out shelter found underground is the only hope for bravery to survive... A thrilling 'exploration' to survive! "Battle" with inevitable monsters! Save humanity from mutagens, gather resources, and build the best shelter! [Game Features] - Easy operation but addictive! A thrilling exploration system! - Collect various resources and fight at high speed! - Construction and operation of various production facilities - Management of residents' happiness and strategic placement - Production and collection of various equipment - Replay elements such as online invasion (PVP) and occupation war (PVE)!