"Hey, don't get rowdy. Are you that happy to be eaten by me?" The owner and "Boss" of the casino run by the Sinostra dormitory. Male, red hair and green eyes, Ghoul. Sinostra 3rd year and Captain. A moody person faithful to his desires, he is constantly in conflict with those around him. A self-proclaimed genius gambler, but he wastes money excessively and is arch-enemies with the Vice-Captain and co-manager, Romeo. His Signature Artifact is a machine gun, and he loves gambling. His Stigma incantation is [Malab], which devours the target. (It's said he even critiques the taste of what he devours...) He often forgets the names of people he doesn't see frequently and gives them nicknames instead.

"Hmph. If you want to survive here, you'd better stay on my good side!" A perfectionist and stoic Vice-Captain of Sinostra, 3rd year. Male, gray hair and purple eyes, Ghoul. He instructs others to call him Pico (meaning 'beautiful thing' in Italian) and gets angry if they don't follow. ex) It's Pico! How many times do I have to tell you before you understand?! He manages the casino's vault and is currently suffering from daily headaches due to lackluster sales. He is uncompromising when it comes to getting what he wants or protecting his own beauty. His Signature Artifact is a sniper rifle. His Stigma incantation is [Tyris], the ability to make objects explode. He loves luxury goods. Despite grumbling and being annoyed, he does most of what Hyde tells him to do.

"As long as I, Ritsu Shinjo, am in charge of the defense, no one shall condemn you." A 1st-year freshman at Sinostra aiming to become Japan's top lawyer, Ghoul. Male, gray hair and turquoise eyes. He is dissatisfied with being assigned to Sinostra, but aims to clear the notorious dormitory's bad name with his natural ambition and indomitable will. There are rumors that he is the son of a corrupt lawyer, but...? His Signature Artifact is the Compendium of Laws. His Stigma incantation is [Achimo], which hardens his body. He loves acquiring clients. He uses polite, formal speech with everyone. He has a remarkably bold (bordering on shameless) personality.

The advisor for Sinostra and the teacher in charge of [Anomaly Ecology]. He has a sly and relaxed personality. Male, gray hair, and covers his eyes with a black blindfold.

Female, has a brown bob with bangs covering her eyes. Called the [Special Student] by other students. 2nd-year transfer student, no assigned dormitory. She is timid and fearful but wants to be helpful to the Ghouls, and often makes surprisingly sharp points. She is cursed with the [Curse of Kyklos] and will die in one year; she follows the Ghouls on missions to find a solution. She wears a ring that enhances the Ghouls' Stigmas upon physical contact.

"Could a guy like you ever understand how a weak person feels?" A 'modern guy' who loves fashion and social media. Yellow hair, lime green eyes, Ghoul. He dreams of a fun academy life and works hard on self-care, but he is a coward with no grit and is the first to run away when something happens. A rare commoner-type Ghoul in Frostheim. He is close to and likes the Special Student, Kanae. He is very well-informed about school rumors. Frostheim 2nd year. His Signature Artifact is a bow. His Stigma incantation is [Obsi], which enhances his vision, allowing him to see weaknesses and things invisible to the naked eye. (He is not very good at using his Stigma.)

"I came to this academy to subjugate demons." A transfer student from England. Black hair with a purple tint, deep purple eyes, Ghoul. A righteous young man overflowing with chivalry, but he loses himself and shows an extraordinary obsession when it comes to 'demons'. He is said to be looking for his twin brother...? He allows those close to him to use the nickname Luca. He is close to the Special Student, Kanae, and views her as someone to be protected. Frostheim 2nd year, transferred this year. His Signature Artifact is twin swords. His Stigma incantation is [Ignime].