The episode begins with Azudra devising a strategy to target the human king with Vermilio and Helck. While Asta explores the human realm, she discovers Shalamy, who is imprisoned in a castle, adding another layer of intrigue and potential danger.

The episode shifts focus to the Demon Lord's castle, where a strong defense against external attacks has been prepared. However, the humans are ready with a counterstrategy, hinting at an impending conflict. A massive horde of monsters, numbering around 30,000—including lifeforms from the New World—attacks from the south, followed by another 50,000 from the northwest. This large-scale assault puts the demons' defense to the test and signals an escalation in the conflict.

The humans demonstrate their ability to wield high-tier arcane magic, creating monster nests, which surprises the demons and intensifies the battle. The humans attempt to capture Shin Castle, employing various tactics and showcasing their determination and ingenuity in warfare.

Inside the castle, Mikaros confronts Azudra, revealing his past and his awakening to immense power. He expresses his desire to witness the birth of the New World, a goal that drives his actions. The episode then delves into Azudra's past, unveiling his fearsome reputation and influence over others, including Mikaros.

The episode culminates in a tense confrontation between Mikaros and Azudra.