A "scarlet fog" of unknown origin enveloped the world, and the order of civilization collapsed overnight. The world is no longer a paradise for humans, but a wasteland occupied by alienated monsters. Ling Che, a librarian in the pre-civilization era, relied on his knowledge and the supplies he had hoarded before the end of the world to build a relatively safe barrier in the library where he worked, and lived alone for three years. However, when the food and water sources were exhausted, he had to step out of the safe fortress and step into a world completely changed by scarlet. His goal is simple, not to save the world, nor to find out the truth, but to find the legendary "pure land" that is not polluted by fog and survive.
