A mysterious humanoid monster that suddenly appeared mercilessly attacks Reno and Iharu. While protecting the mortally wounded Iharu, Reno bravely confronts him. Relying on information from Kikoru, who had met the same monster during the selection exam, Reno barely manages to bite him, but is gradually cornered.

As the search for "Kaiju No. 9" disguised as a human continues, a swarm of monsters suddenly attacks the Tachikawa base, where Mina is absent! The leader of the pterosaur monsters that never swarmed was a new "giant monster" who understood human language and had intelligence. As if enjoying the battle, the monster sets its sights on the strongest member = Hoshina on the spot.