The story takes place in a modern metropolis, where the folk reasoning team "City of Fog" is constantly exposed to intricate social cases. As each member's background is gradually revealed, the mystery the team solves expands from individual cases to dark forces that have been hidden for many years. The cases appear to be independent on the surface, but in reality there are undercurrents; behind each mystery there are deeper implications. The main plot revolves around team growth, trust building and disintegration, while the subplot involves the personal grudges of team members, the deep structure of society, and the layout of villain forces. In the end, everyone worked together to uncover the city's shady curtain and achieve self-salvation.
