In an apocalyptic world ravaged by the Black Erosion virus, human civilization is on the verge of collapse. Survivors are forced to take refuge in the fabled Ark Shelter, a vast shelter controlled by the mysterious artificial intelligence system, Noah. Every survivor is implanted with a Survival System, which assigns resources, missions, and skills according to their performance. But beneath the shelter's polished surface lie countless secrets: the origin of the virus, the System's true purpose, and the fate of humanity.
