When the thick fog swallowed up the entire city, it also buried all the roads home. A young man with amnesia woke up from the fog, holding half a blood-stained map, and behind him were countless pairs of eyes peering through the fog. He must search for his lost past and truth in the ruins of this city that is forever shrouded in fog, and every mystery he solves brings him closer to a chilling fact - perhaps, the only way out of the fog is to become the fog itself