A short background story about Uragami is shown, though there is no clear explanation as to how he attained his special ability to tell parasites apart from humans. He initially suspects Shinichi, but later on brushes his suspicions aside. Even though Hirama still surmises Shinichi, he asks him for his help, together with the serial killer, to help the police conduct an operation to exterminate the aliens. Yamagishi, the other officer in charge of the core operation to identify and eliminate the enemies, also has a sensing system that he claims to be able to recognize parasites.
Takeshi Hirokawa, on the other hand, talks with Gotou about their missing members. They conclude that Kusano, Hikawa and Maesawa were killed by Tamura Reiko, who in turn, was also shot dead by the police in the park.
The operation led by Yamagishi and Himara commences at the building where Hirokawa works. The police order the people in the building to evacuate the area by groups of seven, pretending that an armed suspect is concealing himself on the rooftop. As each group of people exit the building, they are being monitored and examined by the sensory device used by Yamagishi to hunt which among them are parasites. Uragami and Shinichi are also checking them on the screen, but so far, they haven’t detected anyone yet.
Just then, the sensing system spots the first parasite in the third batch of evacuee, as the investigators prepare to launch their attack.