Time is running out for Kanon Kanase. If they can't stop the faux-angel ritual in time, she'll ascend from realm of mankind and become something truly inhuman. Will the Fourth Primogenitor be strong enough to stop this madness before it's too late? The Amphisbaena arc reaches its heart-pounding conclusion!

Though Kanon Kanase is recovering from her ordeal, her father's research has dangerous implications for the Fourth Primogenitor, and Kojou's hopes of returning to a normal life are premature. The alchemist Amatsuka is after the Wiseman's Blood, a powerful liquid-metal life-form, and he will spare no one in pursuit of his goal. Kojou would never back down from a fight to protect his city and his friends, but this time he will receive help from an unexpected ally...

Kojou, having learned both the secret of Itogami Island and Eustach's true goals, agonizes over the right thing to do even as Eustach presses his attack on the keystone gate. Are the lives of the island's citizens more important than this strange new justice? Either way, their fate is in Kojou's hands!

Nagisa has collapsed! Kojou rushes to the hospital, but suddenly a mysterious girl appears, and she looks just like Avrora, the former Fourth Primogenitor. She backs Kojou into a corner--but is she the real Avrora? Through this encounter, Kojou regains his lost memories, what will he remember? Finally, Kojou's past and the secrets of the Fourth Primogenitor are revealed!

DEMON DIPLOMACY IS HARD WORK... There’s a celebration to be had in the kingdom of Aldegia, and Princess La Folia invites Kojou to join in the festivities. Reluctantly accompanied by Kanon, he travels to the royal palace for the signing of a peace treaty between Aldegia and the Warlord’s Empire. Not all are in favor of the agreement, and many hold their breath in anticipation of violent opposition. Unfortunately, these fears are realized when a large-scale terrorist plot brings a deadly mon...

The sealing ceremony for the relic of The Cleansing is finally underway. But just as it seemed the problem was taken care of once and for all, the ceremony gets interrupted by an incredible surge of magical energy coming from below. Avrora, the disaster sleeping at the bottom of Kannawa Lake, has awoken... In an attempt to rescue Nagisa, Kojou and Yukina venture out onto the frozen lake and find themselves facing off against a mysterious flying dragon; a vicious encounter that sends them s...

This is only the beginning…Chaos descends upon Itogami Island! Air and sea transportation have come to a grinding halt and key personnel from the Gigafloat Management Corporation are being assassinated one after another. The proud culprit behind this series of attacks is the self-proclaimed Demon Sanctuary destruction group, Tartarus Lapse. At the same time peculiar changes begin to occur within Nagisa as the soul of the Avrora bleeds into her consciousness. In her time of spiritual turmoi...

NO REST FOR A PRIMOGENITOR…It’s a new term at Saikai Academy, and fortunately for Kojou, hehasn’t been held back a year! Freed from his constant work defending Itogami Island, he is ready for some peace. However, an entirelynew demon beast appears, and when Rui and Yuno are dispatched to deal with it, they are gravely wounded. Kiriha forms an unlikelyalliance with Shizuri, who is dead set on avenging her friends. Meanwhile, the Japanese government has concerns about Yukina’s ability to con...

Blue Elysium is a newly constructed, additional manmade isle off the Demon Sanctuary of Itogami Island: the latest, greatest resort, boasting pools, and an amusement park! Yaze schemes to invite Kojou and the others to the isle before its public opening, but somehow the "free" trip lands Kojou in a horrid part-time job.Meanwhile, Sayaka Kirasaka, Shamanic War Dancer of the Lion King Agency, visits Blue Elysium as well. Her mission: to rescue the mysterious girl Yume, held captive inside a ...

It's not easy being popular...In the wake of the destruction caused by the Roses of Tartarus, reconstruction begins on Itogami Island. The people laud Asagi Aiba as their savior, and she’s even become something of a local idol. But her boom in popularity is actually a conspiracy by the Gigafloat Management Corporation to cover up the fact that she’s being held captive! Catching wind of this, Kojou and Yukina rush to her rescue. But of the many challenges that stand in their way, the bigges...

When Kojou Akatsuki went to visit his sister in the hospital in middle school, he met a vampire named Avrora. Once he learned she was the key to saving Nagisa's life, he helped Avrora escape. Now, the weapons dealer Zacharias is telling him to hand over Avrora in order to rouse the fourth primogenitor! As Zacharias's plans plunge Itogami Island into peril, the fourth primogenitor finally awakens...

The war that changed everythingIt’s a Valentine’s Day that Kojou won’t soon forget! Amid the buzz of crushes and chocolate, dark words arrive on the wings of Glenda, the Dragon of the Swamp. Velesh Aradahl is holding Yuiri and Shio captive! And using them as collateral, he challenges Kojou to a vampire duel...At the same time, the Holy Ground Treaty Organization has deemed all of Itogami Island—altar for The Cleansing and domain of Dimitrie Vattler—a global threat. The only way to get the ...