The Fourth Progenitor—That's the world's strongest vampire that should only exist in legends. Accompanied by twelve Kenjuu and spreading calamity, this phantom vampire appeared in Japan. For the observation and obliteration of this Fourth Progenitor, the government and Lion King decided to dispatch an attack mage known as a Sword Shaman. However, for some reason, the one chosen for the observation was an apprentice Sword Shaman girl, Himeragi Yukina. Wielding the strongest anti-progenitor spirit spear, Yukina arrived at Demon District, Itogami City. What is the true identity of the Fourth Progenitor, Akatsuki Kojou, she encountered over there!?

Informations Source: Wikipedia