Kojou and Yukina join forces with Natsuki Minamiya to protect Itogami City from a new threat from the skies--but even Kojou's Beast Vassal can't take this new foe on, and who should rescue them from their predicament but Kojou's sister's friend, a silver-haired girl named Kanon Kanase! But when Kanon disappears, Kojou and Yukina may find that there are some problems not even the world's mightiest vampire can solve!

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 continue observing the Fourth Primogenitor, so the Lion King Agency readies a replacement. As Yukina frets over this threat to her position, her stress only grows with the arrival of a mysterious girl who looks exactly like her!

THE REVIVAL OF THE TRUE FOURTH PRIMOGENITOR IS NIGH! When Kojou Akatsuki was a junior high school student, he met a vampire named Avrora...and then he saw her again when travelling to the hospital to visit his sister. When Kojou learns this mysterious, quiet girl could be the key to saving Nagisa's life, he helps her escape the Magna Atraxia Research lab. With the arms dealer Zaharias planning to use Avrora in his Blazing Banquet, can Kojou stop the revival of the true Fourth Primogenitor and save Itogami Island?

Kojou Akatsuki lives on the artificial island of Itogami, and he has a secret: He's the "Fourth Primogenitor," the most powerful vampire in the world. He's carefully kept this dark knowledge from his family and friends, but one day, a beautiful girl named Yukina Himeragi appears before him and tells him that she knows who he really is--and that she's been sent to...kill him?!

When all the students depart for a school field trip to the mainland, Kojou is delighted to hear that he'll finally get a chance to be free of observation for at least a little while, whereas Yukina has mixed feelings about the whole situation. But events move quickly when an alchemist by the name of Kou Amatsuka appears, with the goal of reviving the holy grail of alchemy--a liquid-metal life-form known as "Wiseman's Blood." As the crisis deepens, even Asagi becomes involved when this alchemist's relic grows more and more uncontrollable. What can the world's strongest vampire do?!

After partnering with Natsuki Minamiya to capture the Masked and end the destruction in the sky, Kojou and Yukina are shocked to discover one of the winged girls is none other than Yukina's classmate Kanon Kanase! When Kanon disappears, Kojou and Yukina seek out her adoptive father, a researcher at megacorp Magus Craft, Inc. Far from the professional meeting they expected, the two find themselves abandoned on a deserted island! It is deserted...isn't it?!

--Let's get this story moving. Alongside the people most important to him, a boy goes out to meet the same sunrise once more. Strengthening his resolve, Subaru returns to his first day in the mansion. Repeating his loop in the Roswaal household armed with his memories, Subaru attempts to only make the optimal decisions to avoid another tragedy, but his fear and obsession with evading death and failure are slowly warping him. While Subaru slowly falls apart trying to save everyone...who will save Subaru...?

WHEN ALLIES BECOME ENEMIES, WHO CAN YOU TRUST? New Year's Day is right around the corner on Itogami Island, and everyone is getting ready to celebrate! ...Well, almost everyone. Nagisa, off on a trip to the mainland to visit her grandmother, hasn't been returning any calls or texts. Equally troubling is Yukina's sudden and complete loss of contact with the Lion King Agency. When Kojou and Yukina's frantic attempts to find answers reveal evidence of a magical incident, Kojou decides to risk everything and travel to the mainland to find Nagisa himself. But in hismost desperate hour, an unexpected adversary stands in his way...

Aya Tokoyogi and six other hardened magical criminals have broken out from imprisonment. Their goal--to completely erase the 'Witch of the Void,' Netsuke Minamaya, from existence. How these events will unfold in the Demon District will depend on the actions of the strongest vampire to ever exist, Kojou Akatsuki.

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 turmoil, a mysterious girl appears before her and introduces herself as "December." What Nagisa doesn't know is that this girl is the leader of Tartarus Lapse, and she has a special ability capable of overwhelming even the Fourth Primogenitor...!