The modern city "Fog Harbor City" is shrouded in sea fog all year round. Deep in the port lies the sealed old ruler "Fog Nightmare". A hundred years ago, the first-generation scavenger organization "Gray Crow" sealed the old gods with a blood contract at the cost of each leader sacrificing his soul. Nowadays, "Mist Erosion" appears on the edge of the city - patients' skin appears with fog-like lines, and they gradually lose their self-awareness and become "dependents" of the old gods. The story combines the Cthulhu mythology system (Old Dominators, Familia, Sanity Collapse) and original reasoning. When the male protagonist is investigating the disappearance of his sister, he is involved in a century-old game between the "Gray Crow" and the "Deep One". In the gap between reality and illusion, he pieced together the truth of "symbiosis between humans and gods" that was obscured by the fog.
