In the shadow of the bustling and modern city, there is a secret police department unknown to the public - the "Special Investigation Section". It specializes in cases that are filed as "unsolved cases" or "urban legends" by regular departments because they are too weird, bizarre, and contrary to common sense. The members of the department are all "problem elites" who have retired from the front line for various reasons. They wander on the edge of science and metaphysics, rationality and madness, and explore the hidden truths.
