Gardos the terrorist has reawakened the ancient weapon, Nalakuvera. Kojou and Sayaka barely escape with their lives, but they fall into the depths of the manmade island. Asagi hurries to analyze and control Nalakuvera while Yukina fights a fierce battle to stop Gardos.

Yuuma's goal was to use the Fourth Progenitor's magic power to free her mother from the prison barrier. In accordance with her plans, the prison barrier appears above the ocean's surface near Itogami Island.

Asagi has been caught up in Kou's attack. Kojou and Yukina rush to save her, deciding to take her to Mimori's lab for treatment... but when they stop at Kojou's place on the way, another personality takes over Asagi's body.

A renewal of the non-aggression treaty between the Kingdom of Aldegyr and the Warlord's Empire is scheduled to be signed in the acceptably neutral Itogami City. King Lucas' misgivings about La Folia's relationship with the Fourth Progenitor result in him pressuring his daughter to quickly get engaged to someone. The Rihavein's host a large event that night and everyone is invited. Giant, flying, demon bugs crash the party and menace the attendees.

Lucas and Polifonia discuss the abduction with security. Meanwhile, with the two abductees bound and gagged nearby, erstwhile maid and now full-time terrorist Trine Harden discusses their plans while humiliating Kojo. The world is oblivous to the abduction which is kept from the public. On the day of the ceremony, at Trine's command, Kojo boards and takes over the Aldegyrian flagship, the Bifröst.