Strike the Blood, Vol. 21 (light novel)

Kojou has finally defeated the Blood, but with Ren abducting Avrora and fleeing to another world, theres no time to celebrate. And with Kojous vampiric powers gone, staging a rescue seems impossible...until the First Primogenitor, Ki Juranbarada, shows up with a striking proposal and a tempting offera new set of Beast Vessels. But when Juranbaradas gift transforms Kojou into a monster devoid of reason, its up to Yukina and company to find a way to save him before its too late!