Kyoko Hirose (広瀬 京子,Hirose Kyouko?) is a second year high school student and the main protagonist of Blood School.
Kyoko has long, straight, dark blue hair that reaches just past her shoulder blades and deep blue eyes. Like the other girls at her school, she wears a yellow blazer and pleated skirt, a white, long-sleeved blouse and a red ribbon. Kyoko in particular wears thigh-high white stockings and brown shoes.
Kyoko is a very polite young girl and very friendly, liking to joke about with her friends and tease them. Along with this, she has a deep loyalty and devotion to them, refusing to leave the school building with Kyoya unless all of her friends can go with her. She has an emotional side to her, and easily blames herself if any of her friends are harmed.
It is possible that Kyoko is based on Ayumi Shinozaki due to her personality.
It can also be noted that in one of the endings she stabs herself multiple times, much like Ayumi did in Corpse Party; Musume manga.