THE INVASION OF ARKANA BEGINS!With Marida's safe birth behind them, Albert and his allies set their long-prepared invasion of the Arkana Domain into motion. Their strategy draws the bulk of the enemy forces away from their stronghold, clearing the way for Albert's advance.Meanwhile, Burest leads a separate unit to strike at the kingdom's supply convoy bound for the besieged Arkana Castle, threatening to sever the enemy's lifeline and tip the balance of the campaign. Each move brings them closer to victory—but the outcome of the war is far from certain.Albert's past-life knowledge shapes the course of battle in the sixth volume of this isekai harem fantasy!