Harumi is after the MAR trailers, unaware they are decoys filled with MAR Armored Troops, but is saved by Mikoto. As Mitsuko, Kuroko, Yomikawa and the AntiSkill hold off the rest of the MAR Troops, Harumi, Kazari and Ruiko head towards to Kihara's laboratory while Mikoto defends them from Therestina, who is piloting a large Mech. Although Therestina mech is unaffected by Mikoto's basic attacks, she manages to destroy the mech with a powerful railgun with Kuroko's assistance. Mikoto, Kuroko, Kazari, Ruiko and Harumi finally arrive at the underground lab where the children are, but before they can do anything, the lab's Capacity Down is activated, revealing that Therestina has survived and proceeds to beat everyone down. Therestina reveals her plans of using the first sample from herself and the children to turn Erii, due to her unique powers, into a Level 6 at the price of the destruction of the city. As all hope seems lost, Ruiko, the only one not affected by Capacity Down, destroys its controls, allowing Mikoto to defeat Therestina with her railgun. With the first sample in hand, Harumi creates the cure which finally awakens Banri and the other children, giving her thanks to Mikoto. In the aftermath, the recovering children give a birthday message to Harumi via a blimp as Mikoto and her friends watch.