After repelling the Port Mafia's Black Lizards with deceptive ease, Atsushi is tasked with accompanying Rampo to a case. Skeptical of the self-dubbed great detective who seems to lack all common sense, Atsushi is about to witness Rampo's ability first-hand...

The Agency investigates a series of disappearances in Yokohama. Kunikida enlists the help of a hacker named Taguchi Rokuzou, but all they find are photos of the victims and mention of a mysterious figure called the Azure Messenger. They follow the trail of clues to an abandoned hospital...