An 11th-grade female student. Her real name is Haru Sakurai. She uses a katana as her weapon and is a master of Aikido. She is ranked number one in the school for swordsmanship. She is cool-headed and generally uninterested in others, though she shows kindness on occasion. She is slightly curvy with a large backside, but bringing it up will put her in a foul mood.

A 12th-grade male student and the top-ranked fighter in the facility. He possesses both high intelligence and superior physical abilities. He primarily uses a combat knife and a Glock 17, but he is a genius capable of mastering any weapon. Despite being a high school senior, he enjoys smoking. He specializes in Chinese martial arts. He lives life on a whim and can be foul-mouthed. Even if asked for his name, he will only give 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 and Liuyedao (willow-leaf throwing knives). He speaks politely and uses formal language even with younger teachers and students. He specializes in a unique martial art that blends Aikido and Chinese martial arts.

A 10th-grade male student. His real name is Kira Kugimiya. His weapons are specialized gloves with steel-reinforced fingers designed for mobility. He wears steel armor on his forearms. He is the biggest troublemaker among the freshmen and is hungry for power, picking fights with many people. However, he is genuinely strong. He is proficient in almost all forms of martial arts.

A 12th-grade female student. Her real name is Mio Hagiwara. Her academic grades and marksmanship are the best in the facility. She uses Systema for combat. She is a mature, alluring older-sister type. A kind senior to everyone, she is admired by female students and popular among male students for her beauty and great physique.

A teacher. His real name is Kota Ishikawa. He is loathed by both staff and students because he smells of old-man musk and body odor, and his way of speaking is creepy and annoying. He is in his late 40s to early 50s and teaches Weapon Manufacturing. He uses self-made guns and a kanabo. He specializes in Sumo and Judo. He has no interest in men and subjects women to horrific sexual harassment.

A 24-year-old female teacher. She possesses elite combat abilities and teaches knife fighting. She is incredibly fast. Her martial arts style is entirely self-taught and relies heavily on feints. She is a calm and cool-headed instructor. She graduated at the top of her class from this facility. She became an assassin after graduation 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 10th-grade student. His real name is Sora Hiramatsu. He has a playful, jokester personality. His weapons are sharp steel fans and a handgun; the fans are capable of deflecting bullets. He uses Bajiquan in combat. His fighting strength is among the top tier in the facility, but he is not very bright.