Kojou Akatsuki, the high-schooler who carries the power of the Fourth Progenitor, the world's most dangerous vampire, lives on the artificial island of Itogami City under the watch of Yukina Himeragi, the young Sword Shaman assigned to monitor him. This OVA continuation opens at Blue Elysium, a new marine resort running its trial opening, where the group spends a day off. Sayaka Kirasaka is taken by an unknown sword shaman, and a schoolgirl in black carrying a case like Yukina's turns up among the crowd.