From Autumn Scans: The fourth primogenitor - is the strongest vampire who exists only in the world of legends; yet when this masters the 12 kenju, the spread of the catastrophe of the vampires will appear in Japan. In order to spy on and erase this, "fourth primogenitor," the government-owned Lion organization has decided to send an attacking magician, "sword shaman" to complete the task. Yet unknowingly, the one who was selected to spy was actually a trainee "sword shaman" girl - Himeragi Yukina.
The young man Huey took over the old mansion of his deceased bibliomanic grand father as well as the book collection that's stored in there. But there was a condition: he also had to inherit the "Bibliotheca". When he inspects the mansion, Huey discovers a cellar filled with piled up books. In the midst of them he comes across a black-dressed girl who's silently reading a book. She's called Dalian and has a big lock hanging in front of her. She herself is the entrance to the "Bibliotheca of Dantalian" which contains the prohibited "Phantom Books".
In an already-destructed Japan, Yahoro spent his day working as "the collector". He had finished up his work as the collector today as well when he ran into the so-called "monsters". He got had his internal organs jacked up and "safely" arrived at his bed.