Author: Gakuto Mikumo
Illustrator: Manyako
Label: Dengeki Bunko
Synopsis:
"The fourth primogenitor"—That's the world's strongest vampire that should only exist in legends. Accompanied even by tweleve Kenjuu and spreading calamity, this phantom vampire appeared in Japan. For the observation and obliteration of this "fourth primogenitor", the government and Lion King decided to dispatch an attack mage referred as a "swords shaman". However, for some reason, the one chosen for the observation was a apprentice "swords shaman" girl, Himegari Yukina. Wielding the strongest anti-primogenitor spirit spear, Yukina arrived at Demon District, "Itogami City". What was the true identity of the "fourth primogenitor", Akatsuki Kojou, she encountered over there!?