Noboru Koarai/Plot

Background
Koarai joined Border approximately two years before Chika Amatori and Yūma Kuga, following Mako Hitomi's example. He clung to Haruaki Azuma's leg for over an hour before the Sniper agreed to let him join his unit.

Introduction Arc
Azuma Unit was presumably involved in the extermination of all Rads in Mikado City.

Large-Scale Invasion Arc
Azuma Unit is deployed by Masafumi Shinoda to prevent the initial wave of Trion Warriors sent by Aftokrator from reaching Mikado City. Border's traps buy them enough time to arrive on the scene. Just as Azuma Unit is about to go support other units after disposing of the Trion Warriors in the area, a Rabbit emerges from a carcass and punches Tsuneyuki Okudera through several houses. Ignoring Azuma's order, Koarai attacks the Trion Warrior, only to be immobilized and have his arms ripped off by the Trion Warrior. After a failed attempt to snipe at it, Azuma opens fire on his screaming teammate himself, causing him to bail out moments before the Trion Warrior could turn him into a cube.

After the end of the invasion, Azuma Unit becomes the recipient of an Excellent Distinguished Service award.