Address terms: Kokoro, Kokoro-chan Grade/Age: 7th Grade (12 years old) Traits: A quiet, serious, and sensitive girl. Details: She suffered deep emotional scars due to insidious bullying and harassment from classmates (a group led by Miori Sanada), leading her to stop attending school and withdraw into her home. She is poor at putting her feelings into words and constantly worries about what others think of her. Born in 2006. A student of Yukishina Fifth Middle School.

Address terms: Rion, Rion-kun Grade/Age: 7th Grade (12 years old) Traits: A handsome, refreshing boy who is great at soccer and has excellent athletic reflexes. Details: Contrary to his breezy appearance, he has a sad past, having lost his beloved older sister to cancer when he was young. Currently, at his parents' behest, he is studying abroad at an international school in Hawaii and does not attend school in Japan. While in the "Castle," he is somewhat philosophical and serves as a reliable presence who kindly looks out for the often-isolated Kokoro. He is as handsome as a celebrity, bright, and friendly, speaking equally to all the unique members of the castle. Born in 2006. He was supposed to attend Yukishina Fifth Middle School, but for certain reasons, he attends school in Hawaii.

Address terms: Aki, Aki-chan Grade/Age: 9th Grade (15 years old) Traits: A stylish girl who wears flashy casual clothes; a big-sister figure. Details: The oldest of the seven. She was a member of the girls' volleyball club in middle school, but she stopped attending after being hurt by family issues and interpersonal troubles at school. At first glance, she seems strong-willed and blunt, but she is essentially very kind and sensitive. She acts as a leader and confidante for the younger members. Born in 1992. A student of Yukishina Fifth Middle School.

Address terms: Subaru, Subaru-kun Grade/Age: 9th Grade (15 years old) Traits: A tall, cool boy with a calm atmosphere. Details: The same age as Aki. He is dexterous and knowledgeable about mechanics and electronics, often seen quietly tinkering with game consoles in the castle. Though a man of few words, he is capable of objective and calm judgment, showing a mature response when trouble arises. In his real life, he stopped going to school following a certain incident. Born in 1985. A student of Yukishina Fifth Middle School.

Address terms: Masamune, Masamune-kun Full Name: Masamune Seiji Grade: 8th Grade Traits: Wears glasses; a cynical, argumentative boy who isn't very honest with his feelings. Details: A smart boy who loves games and speaks in a logical, pedantic manner. He has a habit of acting tough to look cool, but at heart, he cares for his friends and gets lonely easily. It's not that he couldn't keep up with schoolwork; rather, he became isolated and stopped attending due to the pressure of his elite prep school and the emotional distance between him and his peers. Born in 2020. A student of Yukishina Fifth Middle School.

Address terms: Fuuka, Fuuka-chan Full Name: Fuuka Hasegawa Grade: 8th Grade Traits: A graceful girl with glasses; skilled at the piano. Details: A girl who has taken piano lessons since childhood and practiced rigorously with the goal of becoming a professional. She is polite and composed but struggles to express her emotions. She has lost her confidence due to excessive expectations from her mother and suffocating social dynamics at her music school. Born in 2013. A student of Yukishina Fifth Middle School.

Full Name: Haruka Ureshino Grade: 7th Grade Traits: Chubby, a foodie, falls in love easily, and perhaps a bit cringey? Details: A boy who is a bit prone to delusions, immediately assuming a girl likes him if she is kind to him. He loves eating. He has a pure, straightforward personality. He stopped going to school after social troubles involving girls. Born in 2027. A student of Yukishina Fifth Middle School.

True Identity: A mysterious girl wearing a wolf mask. Traits: Wears a dress; has an arrogant tone but is strict about the rules. Details: The "Castle Master" who gathered the seven children in the mirror castle. Her face is hidden by a mask, and while her voice sounds like a young girl's, she speaks with a condescending and cheeky attitude. She announces the rule that "only the one person who finds the Wishing Room Key hidden in the castle can have any wish granted." While she seems cold at first, she is actually observing the children closely. She is Mio Mizumori, Rion's older sister. She died when Rion was six years old, but appears as the Wolf Queen. Had she not fallen ill, she would have attended Yukishina Fifth Middle School.