Saki Azuma was once a reasonable and ordinary woman, working as a professor at an all-girl college. Her character is shaped by a consuming devotion to her boyfriend, Mikami, a sadistic pervert previously dismissed for assaulting a student. This loyalty clouds her judgment of his true nature.

She secures a teaching position for him at her college, where he soon begins targeting female students to fulfill his dark compulsions through private sessions. Mikami coerces Saki into assisting him, drawing innocent women into his depraved schemes.

Her background and evolution revolve around this tragic spiral of manipulation. An initially conventional woman becomes irrevocably complicit in criminal acts under the weight of psychological coercion and distorted affection.