Yamagiwa Murder Case

The Yamagiwa Murder Case is a case forwarded to the agency regarding a murder of a woman named Yamagiwa.

Prologue
The agency receive another murder case right after the Black Lizard's raid to the agency. Kunikida asks Atsushi to accompany Ranpo to assist him in using the train since the agency is on full hands cleaning the agency office.

Case
Ranpo and Atsushi arrive at the scene, greeted by Minoura. It was revealed that the victim is his subordinate. Officer Sugimoto and Minoura brief the two about the murder case. The police having no information about the culprit tells Ranpo that they can't leave the case to an amateur like him. In the middle of the investigation, Osamu Dazai was caught by the police flowing down the river. Not requesting Ranpo for assistance, he points out to Officer Sugimoto solve the case which the latter just barely summarize what was known so far and failed to solved the case.

Minoura mocks and urges Ranpo to show his ability instead of talking about all his ability and him being a master detective. Ranpo happily accepts the request and begins to deduce the case. Ranpo deduces the culprit behind the murder - pointing out to Officer Sugimoto as the culprit. Minoura just laughs it out telling that Sugimoto can't be the killer as he is part of his team. Ranpo further reveals the reason Sugimoto is near the scene and orders Sugimoto to show his gun - the evidence beind the murder - and explains how Sugimoto will explain the two missing bullets in his handgun. Minoura orders Sugimoto to show his handgun to prove Ranpo wrong but instead Sugimoto draws his gun and points at Ranpo. Sugimoto was successfully restrained by Atsushi.

Resolution
Officer Sugimoto was arrested and interrogated at the police station. It was revealed that he was trying to stop Yamagiwa from exposing a major corruption case on a high-ranking legislator to which Officer Sugimoto was a spy for. Unable to persuade Yamagiwa to hand over the evidence, Sugimoto used another way to solved the issue by threatening to kill himself. Yamagiwa tried to stop him but during the process, Sugimoto accidentally shoots her. In order to hide the evidence, Sugimoto was ordered to hide the body like how the mafia do it. Sugimoto then reveals where the evidence was hidden.

Manga and Anime Differences

 * In this episode, Dazai secretly touches Ranpo's hair during Super Deduction to see whether No Longer Human could nullify Ranpo's ability, which is not shown or mentioned in the manga.
 * This scene is featured in the light novel when Dazai afterwards concludes that Ranpo merely utilizes his regular deduction in solving cases. This instance becomes the first time that Dazai and Kunikida know of Ranpo's non-ability.