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.

The trouble with the Black Death Emperor Faction has been resolved. Kojou has returned to his daily life with Sayaka as a new acquaintance, but he can't decide whether or not he should reveal his vampiric nature to Asagi. It's around that time when he meets a friend of Nagisa's, Kanase Kanon, known as the middle school saint.

Itogami Island's tourist industry flourishes as the season of the annual Halloween Fest draws near. Kojou reunites with his childhood friend Tokoyogi Yuuma for the first time in four years, but Yukina and Asagi are not pleased to see the intimate friendship she shares with him. Meanwhile, when the Meyer Sisters suddenly appear at the Keystone Gate, the "witch of the void," Natsuki, finds herself in danger...

Still stuck in Yuuma's body after the mind switch, Kojou rushes to see Yukina and the other girls. At first they're unsure whether to believe him, but after an explanation, Kojou and Yukina try to locate Yuuma in Kojou's body as they draw closer to unraveling the mystery of the witch of the void.

Kojou and Asagi take Sana on board Vatler's boat, the Oceanus Grave II, to protect her from danger. But Kojou's relief is short-lived as he is soon accosted by Vatler's beautiful young maids, and his stimulation is pushed very close to the limit when he ends up sharing a bath with Asagi...

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.

"Goodbye, Himeragi..." After hearing Kojou say this to her in a dream, Yukina begins to contemplate her future and the coming of the day when she may have to leave Kojou's side.

Strange occurrences at sea result in Itogami Island becoming isolated. Nagisa continues to suffer effects from her previous exertions. A terrorist group known as Tartarus Lapse begins operations on the island.

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Kojou and Yukina prepare to ambush Possession Mask, the group responsible for the attacks around Itogami Island... but one of the Possession Mask members they see is Kanase Kanon.

The deserted island turns out to be a research facility owned by Magus Craft where Kanon's father, Kensei, conducts research. Kojou and Yukina are attacked by a vanguard force, but the one to save them from danger is Princess La Folia of Aldeigia, a young woman with deep connections to both Kanon and Kojou.

Yukina and the other middle school girls are preparing to embark on Saikai Academy's traditional training camp. Yukina is worried about leaving Kojou as she has been released from her observer duties for the trip's duration, but Kojou tells her with a smile to go enjoy her time off.

Yukina stalks Kojo as he plays with Yume. A stranger approaches and while chatting her up, half-jokingly accuses her of stalking. He is Gajou, the father of Kojo and Nagisa. Soon after, he leaves the island with Nagisa. On New Year's Eve, Yukina exploits Nagisa's absence to play house with Kojo in his apartment. Motoki arrives with Yume, Kanon, Astarte and Asagi and all visit the temple together. A cryptic message from Nagisa arrives with only a photo of a magic circle in the sky.

Shio defies Azama. From afar, Shirona incapacitates the lower level cultists. Okiyama appears on a wyvern and leading a second one to retrieve Azama and they flee. Azama joins the other confrontation and first betrays Ueyanagi, transforming him into a golem, and then attacking Yuiri, triggering a distraught Glenda to transform and fly off with Yuiri, Kojo and Yukina.

It's nearly time for the Saikai Academy ball sports tournament, and Yukina and Nagisa are all fired up to act as cheerleaders! And thanks to the workings of Motoki and Rin, Kojou and Asagi are paired up to participate in the badminton doubles match for their class. Meanwhile, Natsuki is occupied with the capture of some therianthropes that have appeared in the warehouse district, and someone is targeting the Fourth Progenitor again...

Kojou and Yukina meet Dimitrie Vatler, a nobleman who shows an abnormal degree of affection toward the Fourth Progenitor, and Kirasaka Sayaka, Yukina's old friend also under the employ of the Lion King Organization. When Vatler proposes that Kojou capture some terrorists hiding out on Itogami Island and Yukina volunteers to take care of them instead, Vatler challenges Yukina to test her suitability for the task. And, though Sayaka has always been a friend of Yukina's since childhood, her behavior starts to change...

In her excessive defense of Yukina, Sayaka launches an attack on Kojou, but he can't control his powers. Yukina's arrival prevents the situation from growing dire, but Yukina leaves them both on the school roof to think about what they've done.

Kojou comes out of the battle with his own body back, but both Yuuma and Natsuki have fallen. The true prison barrier has been revealed along with Yuuma's mother, Tokoyogi Aya, and the other magic criminals who were incarcerated within.

Kojou and company search for Natsuki, whose spiritual powers were stolen by Aya's grimoire and is now missing. Just then, Yukina's surprised voice directs the others' attention to the TV, where Asagi is seen on the live broadcast of the Halloween Fest...

Through Sana, Yukina sees a memory of Natsuki and Aya ten years ago, and then dreams of a happier world she shares with Kojou, Sayaka, and their friends.

The terrorists launch an attack upon the warehouse district. Afterward, Kojo and Himeragi meet the terrorist leader, Senga Takehito, who tries to recruit them. He reveals his beliefs about the true nature of the island, its purpose of reviving Cain, and his plans to oppose this.

At Mogwai’s urging and with Motoki’s assistance, Asagi makes her way to the Keystone Gate in order to end the hacking attack upon the island’s network. Meanwhile, Kojo and Himeragi battle ineffectively against the demons unleashed by the terrorists.

After the terrorist incident on Itogami Island, Kojo and the others are helping with the Island's recovery. On the other hand, Asagi, who gained popularity with the public for preventing hacking in the past incident, works as an ambassador for revival activities for the Island Management Corporation. However, Kojo feels like something is off when he sees Asagi on the big screen.

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No description available