Atsushi is tasked to assist Ranpo, one of the Agency's most intelligent detectives to a murder case on an embankment that revolves around a dead policewoman and where they also meet Dazai. Using his special ability named "Super Deduction", Ranpo reveals that she wasn't killed by the mafia and it is rather a copycat crime committed by a police officer on the scene. The end of the episode marks the story of how the murderer got bribed by a corrupt diet member to kill the policewoman and how Ranpo solved the case with his pure intelligence along with glasses which indicates that he doesn't have a supernatural ability.