Eustach and Astarte continue their assault, finally launching an attack on the central support of the manmade island. When Kojou learns that Asagi is trapped inside, he's eager to save her, but his inability to control his own Familiars holds him in place. Unable to see him go on like this, Yukina makes a suggestion he never expected...

The morning after the battle against the Combat Deacon and his homunculus, the town is left in ruins. Yukina had been shocked to see how vastly Kojou's power exceeded that of the Familiar, but now she learns that Kojou can't even control his own Familiars. Kojou and Yukina pursue the escaped Eustach and Astarte to an abandoned laboratory, where another intense battle awaits them...

When Kojou is disabled in the battle with Kanon, Yukina retreats with him behind La Folia's barrier. Both Yukina and La Folia share their blood with Kojou to aid in his recovery and the awakening of a new power. They have no choice but to rush to Kanon's rescue as her ego slips beyond control and she loses her grip on her humanity.

Yukina moves into the room next to Kojou's. When Kojou sees that she only has a bare minimum of furniture and necessities, he takes her to a hardware store. Kojou's younger sister Nagisa also insists on hosting a welcome party for Yukina, adding up to a very lively day.

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Itogami Island is a manmade island in the middle of the Pacific Ocean where summer never ends. A high school student at Saikai Academy, Akatsuki Kojou, is on his way home from studying with his classmates, Aiba Asagi and Yaze Motoki, when he notices a girl in the Saikai Academy middle school uniform following him.

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.

In his quest to resurrect Wiseman, Amatsuka has finally launched an attack on the ferry carrying Yukina and her classmates. Kanon, believing the others will be safe if she's gone, confronts Amatsuka and tells the sad story of what happened at the monastery five years ago.

Shortly after Yukina lost the use of Schneesturm Wolfin and received an order to return to the Lion King Organization, Itogami Island begins to fall apart under attacks from a magical beast that consumes dragon veins.

Blue Elysium, a new fantasy marine resort, is holding its trial opening and Motoki wants the gang there. Kojo and Asagi end up working a yakisoba booth while Yukina and Nagisa see the sights. Elsewhere on the grounds, Sayaka rescues Yume Eguchi, a younger girl abductee but after giving the girl a photo of Kojo and sending her ahead to the lifeguard centre, is herself taken prisoner by a mysterious sword shaman

Kiriha Kisaki, who works for the Taishikyoku, an agency similar to and in competition with the Lion Kings, offers to release Sayaka once her mission is complete. Until then Sayaka will be put to work. Kojo discovers that Yume is a succubus demon, and her ostensible sister Riru is actually her own alter ego, concocted to cope with past trauma. The others all rise under her mischievous control and make advances upon Kojo.

While Asagi investigates, she is interrupted by Lydianne Didier, who reveals that she is working for the Taishikyoku, managing the LYL program and will protect their systems against all comers. She challenges Asagi to hacking combat and begins her attack. Lilith's spirit awakens early and automatically, contrary to Kazuomi's schemes.

Natsuki magically prevents Kojo from leaving her premises. Kanon recruits Nina to spring him. Outside, Kiriha offers Yukina and him a private jet and false travel documents. Her agency is having fun at the expense of the rival Lion Kings. Asagi continues her efforts to leave the island with Mogwai's aid. Lydianne assists, and later the convict Meiga.

Gajou and Nagisa arrive at the temple at Lake Kannawa. He is captured and his jailers are two Lion King miko, Yuiri Haba and Shio Hikawa. Plans for dealing with the sealing relic known as 'Avalon' are discussed. Shirona Kuraki of the Lion Kings will conduct the ritual involving Nagisa, supported by Yuiri. A side-effect of the ritual will permanently expunge the remnant of Avrora from Nagisa.

Myriad forces continue to converge on the frozen Lake Kannawa. Asagi and Lydianne, riding in the pink tank, are joined by Ibliss, a high-ranking vampire from the Warlord's domain, after he rescued them from flying demons. Gajou and Shio carry the comatose Nagisa across the frozen lake, seeking a haven for her.

Kojo and the others go to rescue Asagi, who was imprisoned on the 0th floor of the Keystone Gate. Kojo is worried about Himeragi's poor condition, but Himeragi goes with Kojo nonetheless. What was waiting for Kojo and Himeragi on the 0th floor?

Kojo and the others are helpless by the power of Meiga Itogami's Cleansing ability. Kojo wonders what the hell this Cleansing ability is. At that time, the truth about the Cleansing is passed on to Kojo. Will Kojo be able to protect Himeragi and Itogami Island from Meigawa Itogami?!

Itogami Island had returned to a peaceful state and Kojo's party was getting excited about the upcoming Valentine's Day. Meanwhile, Kojo sees Asagi getting into a car with one of Vatler's subordinates, and starts to get suspicious. Grenda, who was with Shio and Yuiri, is attacked by Veres Aladar, the Imperial Council Chairman of the Warlord's Empire. Grenda flees to Itogami Island, where Kojo is located.

Kojo goes to Iblisveil Aziz in search of answers on how to defeat Veres Aladar, but Iblisveil only gives Kojo a vague answer. Kojo returns to the agreed place of the duel shorthanded and begins the duel.

Kojo wakes up at Natsuki Minamiya's house. On TV, Asagi and Vatler appear to be working together and declares war against the Holy Ground Treaty Organization. In addition, Asagi says that Grenda will use Cain's legacy that she has protected as her power, to help save Itogami Island. Meanwhile, to save Nagisa, whose life is in danger, Hektos tells Kojo and the others that she will need to hold a ceremony.

With the help of La Foria and Veres Aladar, Kojo broke into the council and declared Itogami Island as his territory as the 4th Primogenitor and gained the right to veto the attack. But for him to be recognized for this, he must expel Vatler from the island and become a true ruler. Can Kojo defeat Vatler, who has absorbed the power of the Cleansing, and save Itogami Island from the crisis?!

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