Chikage Hizaki is an arsonist killer as part of another secret organization.
It was nine years ago when Chikage and her little sister Miyuki lost their parents in the terrorist bombing at the Tabioka Medical Conference. The were both burned alive in the rubble. Chikage and Mayumi went to live with relatives but felt unwelcome. They were taken in by Makoto Ogawa, and lived happily for some time. That was until Chikage came home to find her home on fire with Miyuki inside. Chikage tries to rush in and save her sister, but she was struck by burning debris. Miyuki had did in the fire, and Chikage was scarred over her back.
Several years alter, she was trained by a secret organization to be a killer of criminals. She has a source to vent her rage, and she uses fire to burn her targets alive. The injuries she suffered left a large car on her right shoulder and back that she sees every day in the mirror. It's a constant reminder that she needed to become stronger.
Her first appearance was in Triage X Volume 2 CH. 10 "CASE: 3 Midnight Guerrilla II - Overheat".
Though Chikage was first introduced in Volume 2, her name was never revealed until Volume 3, CH. 11 "Midnight Guerrilla III - Clash of Killers".
Chikage's mission to kill the leader of the Kabuto Syndicate, Yusuke Magari was interrupted after she had burned him alive. Two members of Black Label attacked but she evaded attack and escaped behind the wall of fire she created. Chikage would meet these same two on her next mission to kill two of the Kabuto's officers, Yukio Ohmichi and Masa'aki Oki. Though by the time she arrived she didn't know her targets were already dead inside. Two thugs attempted to attack her later that night, but she set them on fire before going home.
At Mochizuki High School, she met Mikoto Kiba. The two quickly became friends, and she ran into Mikoto later that night. The two talked privately and shared the stories of their past. Chikage was flirting with Mikoto, but she abruptly left. The next day after school, Mikoto helped Chikage with some school work, and they ran into Yuu Momokino being attacked by drug crashed man. They worked together to knock him away, and they discovered a message from the Kabuto Syndicate leader on his dropped phone. Chikage excused herself to prepare to attack.
Chikage reported the situation but was confused that the location the police were heading didn't match the information Mikoto was taking to the police. She arrived to find the female Black Label member she faced before both wounded and being chased after my civilians wearing bombs. Chikage realized that this girl was Mikoto, and she killed one of the men who attacked Mikoto. Chikage left Mikoto behind and started afire so she could go after Kunio Ohmichi. Mikoto still chased after, and they fought on top of the burning building. Makoto Ogawa appeared to finish off Kunio himself. Unsatisfied with Chikage's failure, he revealed he was the one who killed Miyuki for discovering his plans, then he shot Chikage in the eye with his crossbow. Mikoto retaliated by shooting him in the neck. Heartbroken from her discovery of manipulation and betrayal but still alive, she willingly dropped to her death into the burning building, despite Mikoto's pleading. Her remains were never identified.
As an arsonist, Chikage specializes in the use of fire-based weapons. She is also a talented hand to hand combatant to the degree of even besting Mikoto Kiba. Her side arm is the Taurus Model 4510 which is also known as "The Judge". Her rifle is a style of grenade launcher called the XM25 CDTE (Counter Defilade Target Engagement System) , also known as the "Punisher". She doesn't use a sight on the XM25, and loads incendiary rounds in both her weapons.