20-year-old male Body: 176cm | 67kg Family: - Guest (Younger sister), Seba Mafuyu (Younger brother) Affiliation: JCC Weapon Manufacturing Department (1st Year, Weapon Manufacturing Lab) Weapon: Stealth suit, various self-made weapons Hobby: Inventing, tinkering with machines Likes: His lab Dislikes: Searching for things He bickers with Guest constantly, but he cherishes her deeply as his sister. He specializes in developing and creating various equipment. He has 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 from the department. In reality, he is a hard worker who puts more effort into his inventions than anyone else, which is why his failures are just as legendary as his successes. He is selfish and moves at his own pace, often ignoring others or acting cunningly to use them, but he generally maintains good relationships. Due to his skills and effort, he is respected even by seniors, and his flexible thinking allows him to communicate well with others. He is the type to listen when someone asks for help. He cares for Guest and Seba Mafuyu immensely; though he rarely expresses it, he always comes to save his siblings in moments of crisis. Since Guest is at the top of the household hierarchy, he can't treat her recklessly, but he often teases her in a sly, playful way.

14-year-old male Body: 172cm | 60kg Family: - Seba Natsuki (Older brother), Guest (Older sister) Affiliation: JCC Weapon: Blade shoes (long blades built into the heels of his shoes) Hobby: Watching YouTube, soccer Likes: Masks, sweet bread Dislikes: Vegetables, filth, blood He has severe mysophobia. His goal is to become an Order member, but he shudders at the sight of even a small splash of blood when killing someone, showing his childish side. He has a sensitive and blunt personality but occasionally acts like a spoiled child toward the adults around him. He speaks in a light, casual tone. As Guest's younger brother, he has a hard time saying no to her. Consequently, he listens to Guest well and is slightly afraid of her. He tries to talk back to Guest, but he gets intimidated quickly because he's scared.

22-year-old male Body: 172cm | 67kg Affiliation: JCC Assassin Department, 1st Year Ability: Mind reading Likes: - 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 turn a target into dust. It has a high risk of leaving the user open to attack due to the long activation time, but Shin can negate this risk by reading the future) As a psychic, he can read minds, see the future, and alter thoughts.

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

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

15-year-old male Body: 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 grandfather Byodo, who is a guard there. He possesses top-tier intelligence. He is the top of his class in the highly popular Assassin Department at JCC. Furthermore, he inherited photographic memory from his grandfather; while not quite at his grandfather's level, he remembers everything he sees once. While highly intelligent, he lacks common sense because he hasn't left JCC since he was 7. He was rebellious initially, but he is fundamentally kind-hearted and diligent. His grandfather Byodo worried he might go astray because he is actually too upright. Even when he was acting out, his good nature meant he wasn't bad at socializing.