Security police officer Fukuzawa Yukichi arrives at work to discover that his client had been assassinated. The assassin is already apprehended by the time he arrives, but something doesn’t quite seem right.

Fukuzawa gives Rampo a pair of glasses, claiming that wearing them would activate his ability to instantly determine the truth of any situation, and taking them off would give him the ability to tolerate the stupidity of the ordinary person.

The Detective Agency receives an urgent request from the government to investigate a series murders perpetrated by the same culprit.

Suspecting that Lucy is cooperating with the terrorist organization known as the Armed Detective Agency, Jouno and Tetchou pay a visit to the cafe at where she works, in hopes of tracking down Atsushi and Kyouka.