May These Leaden Battlegrounds Leave No Trace, Vol. 3 (light novel)

WILL THE SECRET OF THE DEVIL’S BULLET BE DISCOVERED…?
In the world Rain and Air have Reprogrammed, the introduction of second-generation Exelia in the West has made the war more brutal than ever. Unsure how to mitigate the damage, they begin investigating Kaisei, who may hold the key to the Ghosts.
Meanwhile, Rain’s friend Athly has had her own concerns since the Devil’s Bullet was first used. It seems all these changes in the world are beginning to lead her to one person, so she finally confronts Air directly. But what will Athly do with the knowledge she gains…?