Kojou has finally defeated The Blood, but with Shahryar Ren abducting Avrora and fleeing to another world, there's no time to celebrate. Since Kojou's vampiric powers are gone, staging a rescue seems impossible...until the First Primogenitor, Ki Juranbarada, shows up with a tempting proposal: He'll grant Kojou a new set of Beast Vassals if he agrees to put Ren's ambitions to rest. But when Juranbarada's gift transforms Kojou into a monster devoid of reason, it's up to Yukina and company to assemble twelve Blood Servants and quell his raging powers before it's too late!