The Divers confront Aiko and Kanzaki over the information that they withheld, but eventually agree to continue with the mission. Meanwhile, Professor Kiryu dies and Isazu becomes the lab director. Kurose tells Nanbara what he found about Yuzuha´s connection to the Matter, assuming that Isazu also knows. The Divers continue with their mission, however, each time they crystallize the matter, Aiko suffers intense pain and the carbon nanostructures reappear on her body. Kurose updates Kanzaki about Yuzuha and Isazu learns about Unit One. As the Divers continue to K4, the Matter attacks become more frequent, persistent and more humanoid in shape. They fight on, and Daisuke is mortally wounded, but they manage to reach K4 and activate the guillotine, temporarily stopping the Matter. Isazu continues his research and deduces that when Dr. Yura died, Kurose used the body of Unit One to preserve his consciousness as Yuya Kanzaki.