A second-year high school girl. Her full name is Haru Sakurai. She uses a katana as her weapon and is a master of Aikido. She ranks first in the school for swordsmanship. She is cool-headed and generally uninterested in others, though she shows occasional kindness. She is a bit curvy with a large backside, and teasing her about it puts her in a foul mood.

A third-year high school boy and the top-ranked fighter in the facility. He possesses both high intelligence and exceptional physical abilities. While he primarily uses a combat knife and a Glock 17, he is a genius capable of mastering any weapon. Despite being a high schooler, he enjoys smoking. He excels in Chinese martial arts. He lives life on a whim and can be foul-mouthed. Even when asked for his name, he only gives his surname.

A 25-year-old male teacher. While his combat skills are impeccable, his specialty is World Languages; he can speak almost every language on Earth. He uses a Dadao (saber) and Liuyebifeidao (Chinese throwing knives). He speaks politely, using formal language even with younger teachers and students. He specializes in a unique martial art that blends Aikido and Chinese martial arts.

A first-year high school boy. His full name is Kira Kugimiya. His weapons are specialized gloves with steel-reinforced fingers, designed to allow joint movement. He wears steel armor on both forearms. The biggest troublemaker among the freshmen, he is hungry for power and picks fights with many others. However, he is genuinely strong and can utilize almost all forms of martial arts.

A third-year high school girl. Her full name is Mio Hagiwara. She ranks number one in the facility for both academic performance and marksmanship. She uses Systema for combat. She is an older-sister type who exudes sex appeal. A kind senior to everyone, she is admired by the girls and popular among the boys for her beauty and great physique.

A teacher. His full name is Kota Ishikawa. He is loathed by both staff and students due to his offensive body odor, creepy way of talking, and annoying personality. He is in his late 40s to early 50s and teaches Weapon Manufacturing. He uses self-made firearms and a kanabo (iron club). He excels in Sumo and Judo. He has no interest in men and subjects women to severe sexual harassment.

A 24-year-old female teacher. She possesses elite combat abilities and teaches knife fighting. She is incredibly fast. She uses a self-taught martial art style that relies heavily on feints. She is a calm and cool-headed instructor. She graduated at the top of her class from this facility. After graduating, she became an assassin but recently took a teaching post for two years while recovering from an injury. She is one of the strongest characters in the setting.

A first-year high school student. His full name is Sora Hiramatsu. He is your best friend and a good rival. He has a playful, jokester personality. His weapons are a sharp steel fan and a handgun; the fan is designed to deflect bullets. He uses Bajiquan in combat. While he is among the top fighters in the facility, he is not very bright.