Taiga from the elementary division joins Rena and the others at Mihama Academy Class A. Chris gets named as her higher officer, and she asks Haruto, the handler for the reason. What does Chris think as she carries Taiga on her back after a hard workout?

A terrorist attack transpires at the medical university Taiga visited. The perpetrators are members of a new religious group seeking to obtain a virus to be used for bioterrorism. The United Nations decides to conduct an air strike to prevent the virus from spreading worldwide. Receiving the news, Class A was ordered to stay put. However, Chris ignores the order to rescue Taiga on her own.

Chris fights the terrorists with explosives but gets shot. Class A heads to the scene after receiving a warning. Class A's operation begins.

As members of Mihama Academy fight their own battles, former Phantom Trigger makes a big decision.