Strike the Blood, Vol. 21 (light novel)

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