An episode coming from the first light novel: Dazai Osamu's Entrance Exam which revolves around a series of cases involving the Azure King where the usual victims are tourists taking a specific cab and never to be seen again by the public. Dragging Atsushi and Dazai in this case, they find out that a taxi driver has been an accessory to the crime according to Rokuzou, an orphan hacker who is helping Kunikida and a witness named Sasaki Nobuko is found almost drowning in a water tank. Kunikida is able to save Sasaki in exchange of other prisoners who die through the gas chamber in an abandoned hospital.