Black Lilith - Onmyou Kishi Towako ~Hebigami no Inma Choukyou~

Since ancient times, "diviners" wielded a great summoning magick.In the age of science they led private lives, but there were some who abused their powers.

Normal men and women were helpless against such criminals.
Thus, the government employed trusted diviners, called "knights", to defend us from those gone rogue.