In the real world of 2030, a disaster called the "Scarlet Fog Tide" swept across the world. In this disaster, 1% of the population was selected to enter a mysterious realm called "Cthulhu Deduction Space". The unselected "real world" suffers from "cognitive pollution", and the only antidote comes from the "sobriety potion" in the deduction space. The story revolves around Lin Shen, a psychological counselor. He was involved in three copies of the deduction space. Through wits and breakthroughs, he finally revealed the truth behind the disaster and successfully saved mankind. This process combines Cthulhu elements, infinite loops, suspenseful reasoning, system tasks and the plot of the doomsday wasteland, showing a battle of wits and courage.
