With the death of the first and second Lord who were leading the orcs, the Self-Defense Forces and the U.S. military launched a massive counter-offensive. On the winter of the year 20XX, the second operation to retake the Kanto area started. Having lost their leadership and against the mass-produced anti-orc weapons, the orcs were quickly defeated, and the operation seemed to be a success. However, after pushing the front line as far as Tokyo, a Oboro unit that was performing a reconnaissance mission, was ambushed and destroyed. Who is manipulating from the shadows the orcs who have lost their leader? In order to solve this mystery, Mikage Azusa, a ninja from Oboro who had been leading this operation from the rear, goes to the front line once again. However, it was all a trap set up to lure Azusa out. Many mutant orcs start to appear in front of Azusa and her junior Mizukaze one after another. Moreover, standing in front of Azusa and her friend are "that man" who should have died already and the strongest orc called "Monarch". Now the curtains opens for Azusa greatest and final battle in order to recover the peace stolen by the orcs.