A girl entrusted with watching over Kojou Akatsuki, a boy deemed the world's most powerful vampire.
She is a member of the Lion-King organization, a secret agency that enforces the sacred treaty between humans and other supernatural entities that resides on Itogami Island. They are in charge of monitoring all progenitors, which includes Kojou, the fourth Progenitor.
Himeragi is a capable fighter and though she is a sword shaman, she actually uses a Schneewalzer lance she calls "Sekkarou" which she carries around in a guitar case, where it serves as her primary weapon against supernatural beings.
