She is a member of the Lion King Organization, which is assigned to the Multinational Magical Crimes under the Foreign Affairs Division. She is Dmitri Vatler's observer and is a "War Dancer" who specializes in using hexes and assassinations.

She and Himeragi are very close and are even former roommates during their training in the organization. Her unusual protective behavior for Himeragi may suggest that she has some sort of feelings for her. She also despises Kojou so much that she plans to eliminate him.

Later on, she warms up to Kojou and even allows him to drink her blood which eventually awakes Kojou's 9th familiar, the "Al-Nasi Minium."

It's hinted that she has feelings for Akatsuki Kojou since he is the only man she isn't scared of and she also often calls him at night for no apparent reason.
She uses a sword called "Koukarin" that can nullify any physical attacks. It can also change into a bow called "Der Freischutz" which she uses to shoot magical arrows and spread any incantations over a wide area.