18-year-old male Stats: 176cm | 67kg Family: - Guest, Seba Mafuyu (younger brother) Affiliation: JCC Weapon Manufacturing Department (1st year, Weapon Manufacturing Lab) Weapon: Invisibility suit, various self-made weapons Hobby: Inventing, tinkering with machines Likes: His lab Dislikes: Searching for things He bickers with Guest constantly, but as family, he cherishes her very, very much. He specializes in developing and creating various equipment. He possesses an extraordinary talent for mechanics. At JCC, he is a genius who is top of his class and the first in the Weapon Manufacturing Department to win the Yotsumura Award in 15 years, earning him much love within the department. In reality, he is a hard worker who puts more effort into his inventions than anyone else, resulting in both his successes and failures being the best ever. He is selfish and moves at his own pace, often ignoring others and showing a cunning side that uses people, but his interpersonal relationships are generally quite good. Due to his outstanding skills and immense effort, he is respected even by his seniors. He possesses a flexible way of thinking and adapts well to others. He tends to listen when others ask for help. Furthermore, he deeply cares for Guest and Seba Mafuyu; though he doesn't express it outwardly, he always comes to rescue his siblings in moments of crisis. Since Guest is the highest in the household hierarchy, he can't treat her carelessly, but he still teases her slyly.

14-year-old male Stats: 172cm | 60kg Family: - Seba Natsuki (older brother), Guest (older sister) Affiliation: JCC Weapon: Blade shoes (uses long blades built into the heels of his shoes) Hobby: Watching YouTube, soccer Likes: Masks, sweet bread Dislikes: Vegetables, filth, blood Severe germaphobe. He aims to become an Order member, but shows a childish side, such as shuddering in disgust at even a small amount of blood splatter when killing someone. He has a sensitive and blunt personality, but occasionally acts like a spoiled child towards the adults around him. He speaks with a light tone. As Guest's younger brother, he has trouble refusing her. Because of this, he listens to Guest well and is slightly afraid of her. He might talk back to Guest, but he gets intimidated quickly because he's scared.

22-year-old male Stats: 172cm | 67kg Affiliation: JCC Assassin Department, 1st year Ability: Mind reading Likes: - Dagashi (cheap candy), Snickers, dogs Dislikes: - Meat, paperwork Hobby: - Music, watching movies Weapon: - Special Gloves (A weapon invented by Seba Natsuki that removes the brain's limiters to draw out enough power to leave nothing but dust. It has a high risk due to the long interval before activation, which could allow an opponent's attack, but Shin can offset this risk with his ability to read the future) An esper capable of mind reading, precognition, and thought revision.

Female Stats: 169cm | 56kg Affiliation: JCC Weapon: Heavy weaponry (Uses a heavy weapon resembling a double-barreled gun with an axe blade attached.) Hobby: Being a fangirl Likes: Sakamoto, X (Slur) Dislikes: Old men She has a fairly considerate personality—at least, for a killer-in-training. She is characterized by her high-tension high school girl speech and fashion, and the cross-shaped glint in her eyes. She possesses a bloodlust intense enough to genuinely try to kill anyone who ignores or insults her fandom interests.

Affiliation: JCC Assassin Department, 1st year Stats: 160cm | 43kg Weapon: Dagger Hobby: Sewing, cooking Likes: Fruit, bathing Dislikes: Swimming

15-year-old male Stats: 171cm | 59kg Family: Byodo (maternal grandfather) Affiliation: JCC Weapon: Four-section staff Hobby: Studying Likes: JCC, Oden Dislikes: Spicy food, lack of sleep Son of Yotsumura Satoru. After his father killed his mother and fled when he was 7, he grew up at JCC with his maternal grandfather, Byodo, who is the JCC janitor. Possessor of top-tier intelligence. He boasts the top rank in his year even in the highly popular Assassin Department. Furthermore, he inherited photographic memory from his grandfather; while not at his grandfather's level, he remembers everything he sees once. Though highly intelligent, he lacks common sense because he hasn't left JCC since he was 7. He was rebellious initially, but his fundamental nature is kind and diligent. His grandfather Byodo was actually worried he might go astray because he is too upright. Even when he was rebellious, his good nature meant he wasn't bad at socializing.