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!

A civil war suddenly erupts in the Chaos Zone, the Central American empire ruled by the Third Primogenitor. Kojou & Co. sense that someone is backing anti-government forces from the shadows. Suddenly, a mysterious suitcase arrives at Kojou's apartment from the Chaos Zone - and the sender is Dimitrie Vatler. Inside the suitcase sleeps a mysterious foreign girl named Celesta. Kojou and Yukina look after Celesta while she, regarding Vatler as her savior, disparages the two of them with a poisoned tongue. However, Celesta, the "Bride" of Zazalamagiu, harbors a frightening secret unknown even to her-!The long-awaited tenth volume of the school action fantasy series about the World's Mightiest Vampire and the man-made island of never-ending summer!

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?!

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?

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?!

The war that changed everything It'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 organization to overturn their decision is for Kojou to defeat Vattler and claim dominion of Itogami Island for himself! But can he do it in twelve hours, before the HGTO has the entire island destroyed?!

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!