Danzai no Regalia

is a Japanese light novel series written by Sadato Taube, with illustrations by Super Zombie. The series began publication on July 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The present age when the devil intervenes and secretly becomes a foreign country by the "Great Summon" ten years ago.

He appears in a mysterious place that is beyond the reach of people in such a world. Zion, the user of Solomon's 72-pillar magic technique "Apocrypha 72 (Goetia)", which inherits the sage's legacy (Regalia) "Solomon's Ring" and destroys the demon with a demon. Belonging to the Black Demon Division (Holy Order), he decides to investigate a mystery with a girl named Sariel, who has the power of the evil eye (Sariel).

But that was just the beginning of the battle with the great demons ...