Sayaka Ryuuzaki

Sayaka Ryuuzaki is the director of a school in which she secretly uses Ryuudouji Shimon to train the female students to be sex slaves who are then sold to the highest bidder. She, as the head mistress, had promises to Ryuudouji Shimon a reward at the end if he does a good job, but since she once was herself trained by him, she has also an unfinished business with him. She is also Suzuka older sister.