Rad Infestation

The Rad Infestation was an attack by Aftokrator in Mikado City between December 11th-13th to both destroy the city, and gain intel on Border's Forces

Background
In the Bamster Yūma destroyed in Chapter 1, were an unknown number of Rads hiding inside of it which lead to many gates opening outside the forbidden zone.

Ilgar Bombing
Ai Kitora meets Osamu and Yūma after school to escort Osamu to Border for judgment. Yūma and Kitora get into an argument while a portal opens up revealing an Ilgar flying toward the city ready to unleash bombs upon it. Kitora tells Osamu to stay, he has no more trion to transform and states that she will take it down herself. Osamu can't stay behind, and with Yūma telling him he couldn't take the Ilgar down he states that he can help the people on the streets. Meanwhile, Kitora jumps on the Ilgar's back and starts attacking it, Yūma looks on as she activates the Ilgar's self-defense bombs on its back. Eventually, she is able to wound it deep enough that it starts to fall; however, it falls in the direction of the worn-torn city it was bombing. Kitora tries, but can't do anything to stop it. Yūma activates his trigger, and with Replica telling him that Osamu said not to be noticed, he attaches a chain and pulls the Ilgar into the river where it then safely explodes. Kitora knows someone helped her take down the Ilgar, and she looks on with hate toward Osamu who helped the civilians. Osamu gave all the credit to Kitora as the one who saved them, and Yūma tells Kitora that there is no contest who the better agent is, Osamu looks beyond rules and ranks. Somewhere else, Yūichi Jin sits upon a pile of Bamsters that he took down, and he is called into Border.