He never asked for this power.
Kojou Akatsuki used to be an ordinary high school boy--but that
wasbefore he became the Fourth Primogenitor, the most powerful vampire
of all time. Worse--he doesn't even remember how it happened. Middle
schooler Yukina Himeragi, meanwhile, is the Attack Mage sent to observe
him--and to stop him if he gets out of control. But was it really a good
idea to send a cute girl to observe a massively powerful vampire boy
whose abilities activate whenever he gets aroused? And on an artificial
island populated with all manner of demonic individuals, each with their
own designs on the Fourth Primogenitor--?!