The Enemy that Lurks in Death's Ground.In the flashback, Saya, Ailain, and Ramis are now being chased by large mutant dogs controlled by Zidd. As the 17th Platoon takes a day off from training, Nina and Harley watching the inter-platoon matches, while Layfon goes out with Mayshen for lunch. However, the city of Zuellni falls into a ditch, attracting a large number of larvae contaminoids from their nest below ground. With an invasion into the regios eminent, Kalian orders all military arts students to defend the city and repel the monsters, despite most of them having no experience fighting against contaminoids. Layfon requests Nina and Sharnid, who are assigned to lead the 9th Platoon to defend the northwest section of the city, to evacuate since they are no match against the bugs, but Nina disregards his advice. After realizing that his friends are in grave danger, Layton later gains the resolve to fight in order to protect the people he cares for. The 9th Platoon abandons Nina and Sharnid after their weapons barely make a scratch against the creatures. When Nina meets face to face with one of the bugs, she is saved by Layfon, who is now equipped with a modified DITE, thanks to Harley. With Felli's help, Layfon locates the nest and destroys the queen contaminoid with his DITE. As sunrise appears, Layfon returns and collapses from exhaustion onto Nina, who can do nothing else but congratulate him.