Natsuki Minamiya

Natsuki Minamiya is an English teacher at Saikai Academy and she is one of few people who knows that Kojou Akatsuki is the Fourth Primogenitor. Outside of school, she is a high ranking attack mage and is referred to as "Witch of the Void". It is revealed that she is the guardian ("the jailer, the door, and the key") of the legendary magical prison that houses the most dangerous supernatural criminals, with her body being sealed inside the prison and while the version of her that appears outside of the prison is merely an illusion. In the Banquet for the Observers, Natsuki's memories were taken...