A gigantic mutant Kaii in the abandoned apartment complex Kana and Akane are at surrounds them in flames. Shigemoto and the others race to find a solution to the problem, but they lack data on the enemy... Kana and Akane try to meet up with Koshigaya, but the flames close in on them. Then Kana remembers something Shigemoto once said to her, and she rallies everyone to take on the Kaii again!