Ikta and crew are assigned to a garrison in the far northern region of the empire: a lonely, desolate place at the foot of a massive mountain range. The garrison staff are petty and corrupt, and don't like it when Ikta slacks off and defies orders. But when they try to throw him in the garrison prison, he stumbles across a secret that they want desperately to keep hidden.

War breaks out in the far north, as the Empire's oppression of the mountain people results in a terrifying backlash. With the one competent leader in the Northern Garrison assassinated, the ignorant garrison commander flings the troops headlong into a highly defended, mountainous position, with disastrous results. Ikta and his friends are kept as part of the reserves for now, but it won't be long until they're thrust into the war as well.

The war against the mountain people continues, and the imperial forces are about to make one last march to their final staging ground. The incompetent imperial commanders pick a route that leaves their flanks exposed to an attack, but fortunately Ikta persuades them to dismount and use their shields. In the midst of the Sinack attack, a group of unknown assassins appears out of nowhere and heads straight for the Lieutenant General! They're heavily armed and highly trained, but can Yatori stop them in time?