Hugh Anthony Disward inherits an old mansion and a personal library from his grandfather. In the basement of the mansion, he meets a mysterious girl Dalian. She is a Dantalian and a gateway to "Dantalian's bookshelf", which stores the prohibited books of the demons.

The 1962 Cuban Missile Crisis was a declaration of war on the Longinus Dreizehn Orden! The Longinus Dreizehn Orden stood in the way of the allied forces during World War II and left them with a sense of defeat, after which they disappeared without a trace… But a certain man’s testimony revealed the existence of this group to the world. The major powers of the world, considering them a serious threat, awaken a witch. One created in secrecy. In the spotlight, the Longinus Dreizehn Orden’s own witch, Rusalka Schwägelin, enters the stage. The battle between witches hurls the stage that is America into a chaotic tempest that defies human knowledge. The truth about the 1962 Cuban Missile Crisis is revealed at last!

The story opens in a burning Berlin in 1945. The "Golden Beast", who had performed the miracle of resurrection there, was interested in a secret operation, which was being carried out in secret. The name of the operation is "Werewolf". In modern day Suwahara City, Erii Honjou has taken fond of a man named Shirou Yusa. As they shared their story, Honjou familiy relation to the city and Shirou, a man who had killed someone as a child, their story become intertwine with the mysterious "Werewolf". *Note: Includes 3 extra chapters.*

Contains spoilers for Dies Irae! On their stroll back home in World War 2 Berlin, Lotus and Anna are caught in the middle of a brawl between two ashen monsters.