A border conflict threatens Ellie's brand-new production base, forcing her to embark on a military expedition and assemble a volunteer army of adventurers and mercenaries. Once she makes her way to Sarjas, the aristocrat-turned-merchant regroups with Lucas's forces. It is now time to launch a covert operation to take back Broccen Fortress, a strategic stronghold that has fallen to the Sarjan and an infamous mercenary corps Ellie has heard so much about. To complicate matters further, Prince Friede and his loyal knight, Robert, appear to be involved in the war. Will Ellie and her allies succeed in driving back the invaders and uncovering the Haldorian prince's plot?