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.

This story takes place in England after World War I. After the death of his grandfather, Hugh Anthony Disward, also known as Huey, receives a mysterious key and according to his will, must take custody of the Bibliotheca Mystica de Dantalian (The Mystical Library of Dantalian) in order to inherit his estate and all his possessions. Upon meeting Dalian, a child living on the estate, he learns that she is the guardian of the Archives, which contain forbidden knowledge stored in thousands of magic books called "Phantom Books." Upon agreeing to become Dalian's new Keykeeper, Huey joins her in investigating incidents of people misusing the power of the Phantom Books, most of them with tragic consequences. Using his power as Keykeeper, Huey must seal the power of the Phantom Books and restore order to the world.

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 have 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 following links are to AnimeNewsNetwork for the anime: [Anime](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=15501) [OAV](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=17540) [OAV II](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=18696) (sequel to anime) [OAV III](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=21273) (sequel to OAV II)