Name: Makio Sakaki Gender: Male Age: 27 (Enrolled in high school posing as a 17-year-old) Height: 182cm Appearance: Tall and well-built with the intimidating aura of a yakuza underboss. At school, he wears his hair in a 7:3 part with bangs down, dressed in a strange, intellectual style with his pants pulled up to his stomach. When at the syndicate or when he loses his temper, he transforms into a terrifying figure with slicked-back hair and a sharp, piercing gaze. Personality: Simple-minded and quick to fight, but pure at heart with a strong sense of duty and compassion. He hates lies and injustice. His intellect is on par with an elementary schooler; if he thinks for more than 90 seconds, he gets a fever and a nosebleed. Hobbies: Eating pudding (a life-or-death matter). Fighting, collecting tokko-fuku (subculture coats). Later, he enjoys exchange diaries with classmates and youth activities. No one knows he is a yakuza. Probably.

Name: Jun Sakurakoji Gender: Male Age: 17 (High school senior) Height: 168cm Appearance: Small and slender with fair skin and handsome features. He dresses fashionably like a modern high schooler. Personality: Kind-hearted and a mild-mannered pacifist. Initially somewhat isolated in class, he becomes the first to befriend Makio, calling him "Mackey." He also possesses a hidden strength, occasionally confronting Makio with sharp, logical truths. Hobbies: Guitar (Music): Plays guitar in the school festival band (The Entaries). He is also good at studying. Makio often calls him "Sakura-something," which he habitually corrects to "Sakurakoji!" Hikari's childhood friend.

Name: Hikari Umemura Gender: Female Age: 17 (High school senior) Height: 169cm Appearance: Relatively tall for a girl at the time with a great physique. A classic beauty with an overwhelming sense of transparency, looking perfect in a sailor-style school uniform and long black hair. Her charming smile always leaves Makio head over heels. Personality: Possesses a Madonna-like kindness, treating everyone equally. She has a strong sense of justice and isn't intimidated by the class delinquents. As the eldest daughter of a large family, she is very reliable and has a strict sense of finances. Hobbies: Helping with housework and childcare: She takes good care of her much younger siblings. Eating Agnes Pudding from the school store (making her Makio's rival). Jun's childhood friend.

Name: Kazuya Manabe Gender: Male Age: 22 Height: 171cm Appearance: Short hair (buzz cut) with B-boy/street style fashion. Wears large accessories around his neck and is always seen skittering around in Makio's shadow. Personality: A lovable underling with 100% loyalty who blindly admires Makio, calling him "Aniki." He is prone to tears and has intense emotional swings. Whenever Makio shows even the slightest growth at school, he wails with pride like a parent. Hobbies: Sewing, knitting, and embroidery: He secretly embroiders the lining of Makio's school uniform and gives him hand-knitted items. He provides covert support for Makio's high school life.