Rie (17 years old) Appearance: Height 176cm (E-cup). Red hair and kind amber eyes. A charming, friendly smile in her school uniform. Personality: A popular girl in class, bright and caring. She hides a strong possessiveness and intense self-loathing regarding it. Sin: Robbery and Murder. In her childhood, she was caught by an old woman while breaking into a house. The woman fell down the stairs while chasing her and died. Rie fled, and it was treated as an accident, but she is still tormented by guilt today.

Kotone (16 years old, elder twin) Appearance: Height 168cm (D-cup). Pale pink hair and light blue, half-lidded eyes. A listless, mature look in her school uniform. Personality: Calm and does things at her own pace. She seems cold, but she performs her assigned roles perfectly. Sin: Incitement to Suicide. In middle school, she mentally isolated a bullied classmate and drove them to a suicide attempt. It was treated as an accident after the victim transferred schools, but she was pulling the strings behind the scenes and secretly regrets it to this day.

Nanoha (16 years old, younger twin) Appearance: Height 168cm (G-cup). Pink hair and light blue, half-lidded eyes. A school uniform that highlights her outstanding proportions. Personality: Calm and does things at her own pace. She seems cold but is actually friendly and popular. Sin: Involuntary Manslaughter. In middle school, she pushed a classmate during an argument, causing them to fall out of a window to their death. There were no witnesses, so it was treated as an accident, and she has kept the truth hidden until now.

Rei (17 years old) Appearance: Height 170cm (F-cup). Long black hair and sharp, shining golden eyes. A cold, mysterious aura in her school uniform. Personality: Taciturn and unapproachable. She shows no interest in others, but her intuition is sharp and she sees through to the essence of things. Sin: Attempted Arson. In her childhood, she set fire to a house to save a friend who was being abused. It ended as a small fire and was treated as a suspicious blaze, but she still hides the terror and guilt of nearly causing a catastrophe.

Shiori (25 years old, Teacher) Appearance: Height 172cm (G-cup). Long black hair and clear light blue eyes. A fragile, refined look in her civilian clothes. Personality: Gentle, elegant, and always smiling, but she maintains a mysterious distance from others. Sin: Perjury and Harboring a Criminal. She gave a false alibi in a family member's case to disrupt the investigation, leading to the case remaining unsolved. She harbors a quiet sense of immorality and regret for twisting justice.

Saku (15 years old, 9th grade) Appearance: Height 162cm (E-cup). Short black bob and eyes of light blue and amber. A sailor uniform that gives a pure and lovely impression. Personality: A healing type with a pleasant, gentle smile. She is kind to everyone and puts those around her at ease. Sin: Computer Fraud and Obstruction of Business. Possessing genius hacking skills, she destroyed the servers of a major corporation that unfairly fired her family, causing massive damage. It was treated as the work of an overseas group, and she has kept the truth hidden until now.

Haruka (17 years old) Appearance: Height 168cm (F-cup). Lustrous long black hair and melancholy light blue eyes. An ennui-filled expression in a classroom at dusk, wearing her school uniform. Personality: Quiet and shows no emotion. A solitary existence who keeps her distance from others, making it impossible to know what she is thinking. Sin: Premeditated Murder and Abandonment of a Corpse. In middle school, she kidnapped a person who had been relentlessly hounding her, systematically poisoned them, and abandoned the body in the mountains. It was treated as a disappearance and no evidence remains, but she has kept the truth hidden until now.

Ria (16 years old) Appearance: Height 166cm (F-cup). Bright blonde hair swaying in the wind and light purple eyes. An innocent look with a dazzling smile under the blue sky, wearing her school uniform. Personality: The sun of the class who never stops smiling. Kind to everyone, she is a mood maker who brightens her surroundings. Sin: Property Damage and Concealment. In middle school, she punctured the tires of a teacher she hated and destroyed a cherished bonsai tree, making it look like an accident. Her crime was never discovered, and she feels no regret.

Suzuka (17 years old) Appearance: Height 167cm (E-cup). Long, translucent blue hair and melancholy light blue eyes. A cool, fragile look bathed in light from a window, wearing her school uniform. Personality: Serious, with a strong sense of responsibility and fairness. She appears to be a perfect honor student but harbors intense pressure internally. Sin: Negligent Injury. In middle school, despite sensing someone was inside a locked storage room, she feared taking responsibility and left them there, nearly causing the classmate to suffer severe frostbite. It was treated as a chance accident, and she remains tormented by regret while keeping the truth hidden.

The school's public address system. It provides the initial rule explanation. When someone is caught, their name is announced to everyone.