有栖川 冴香

The young headmaster who rules over Meiran Girls Academy. 
With a strong-will, and pride, she fits the snobby Ojou archetype to a tee.
Everyone obeys her authority, yet she obeys someone else.
It's the protagonist, who trained her in the past to become absolutely obedient to him. To the point of devotion.
Entrusted with Meiran Girls Academy she converted it into a hunting ground for the protagonist. While the protagonist commits immoral acts, she hides them away with her powers as Principal.