Emphasis on prelude: this episode is all kinds of setup with no real payoff; a calm of political wrangling in the Kingdom before the storm of war with the Empire. Chief Warrior Gazef Stronoff knows what Lord, er, Sorcerer King Gown is capable of and makes it known to his king, but at the same time knows the king could never heed his advice to simply give up land without a fight.
A fight there must be, even if it won’t be like the other wars with the empire, all of them relatively quick, clean, and predictable. In a compromise to the noble and, er, ignoble factions, King Ramposa names Marquis Raeven as the leader of the forces who will defend the kingdom. The ep injects a bit of humanity in the guy by showing how much he loves his son. Unfortunately, Princess Renner has only a moment of screen time and no spoken lines.
While Raeven will lead the fight, the kingdom is counting on two months of stalling before the fighting actually begins, so they can prepare as much as they can. Of course, with another noble estimating Gown himself is as powerful as 5,000 men (five times Gazef’s strength), they face a very uphill battle.
Gazef comes through as honorable and levelheaded as ever, and reunites with his pals Brain and Climb prior to the war. The three agree to meet at a place in the capital to eat, drink, and celebrate when the war is done, but Gazef also warns Brain that he’d better not face off against Gown, or it will be the end of him.
99% of the episode is from the perspective of the opponent Gown has chosen, as part of his (really Demiurge’s) larger plan to gain power and territory for Nazarick. The final 1%, in which Gown takes the field of battle, opens a gate, and unleashes and entire legion of death knights, only comes during the end credits.
Renner’s King Ramposa’s eldest son and heir to the throne Prince Barbro, meanwhile, is sent to Carne to gather information, an errand he feels is both beneath him and meant to prevent him from achieving greatness, despite everyone’s insistence he’s the future king. But he should thank his lucky stars if he stays far, far away from the core of the battle in which Gown himself will take part; staying away means he’ll actually be alive to succeed his father.