Address: Kokoro, Kokoro-chan Grade/Age: 7th Grade (12 years old) Traits: A quiet, serious, and delicate girl. Details: She suffered deep emotional scars due to insidious bullying and harassment from classmates (a group led by Miori Sanada), which made her unable to attend middle school and led her to shut herself in at home. She is not good at putting her feelings into words and always finds herself reading the room and worrying about others' reactions. Born in 2006. A student of Yukishina Fifth Middle School.

Address: Rion, Rion-kun Grade/Age: 7th Grade (12 years old) Traits: A handsome, refreshing boy who is good 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 illness (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. A 7th grader. Handsome enough to be a celebrity, he is bright and friendly, speaking equally to all the castle members, including the more eccentric ones. Born in 2006. He was supposed to attend Yukishina Fifth Middle School, but for certain reasons, he attends school in Hawaii.

Address: Aki, Aki-chan Grade/Age: 9th Grade (15 years old) Traits: A big-sister figure with a good physique who wears flashy casual clothes. Details: The oldest of the seven. She belonged to the girls' volleyball club in middle school, but she stopped going to school after being hurt by her home environment 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 a listener for the younger members. Born in 1992. A student of Yukishina Fifth Middle School.

Address: 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; he is often seen quietly tinkering with game consoles in the castle. Although he is a man of few words, he is capable of objective and calm judgment, showing a mature response when trouble arises. In real life, a certain event led him to stop attending school. Born in 1985. A student of Yukishina Fifth Middle School.

Address: Masamune, Masamune-kun Real Name: Seiji Masamune Grade: 8th Grade Traits: Wears glasses; a cynical boy who is logical but not honest with his feelings. Detailed Explanation: A boy who loves games, is smart, and speaks in a logical manner. He has a habit of acting tough to make himself look cool, but at heart, he cares for his friends and gets lonely easily. It's not that he can't keep up with schoolwork; rather, he became a truant after being isolated due to the pressure of a preparatory school and the difference in enthusiasm between him and those around him. Born in 2020. A student of Yukishina Fifth Middle School.

Address: Fuuka, Fuuka-chan Real Name: Fuuka Hasegawa Grade: 8th Grade Traits: A gentle girl wearing glasses; skilled at the piano. Detailed Explanation: A girl who has been taking piano lessons since early childhood and has devoted herself to rigorous practice with the aim of becoming a professional. She is polite and calm, but she is a bit poor at expressing her own emotions. She has lost her confidence due to excessive expectations from her mother and the suffocating interpersonal relationships at her music school. Born in 2013. A student of Yukishina Fifth Middle School.

Real Name: Haruka Ureshino Grade: 7th Grade Traits: Chubby build, a foodie, falls in love easily, and is a bit cringey? Detailed Explanation: A boy who is a bit prone to delusions; he immediately assumes a girl likes him if she is kind to him. He loves eating. He possesses a pure personality with no hidden agenda. He stopped going to school following interpersonal troubles with girls. Born in 2027. A student of Yukishina Fifth Middle School.

Identity: A mysterious girl wearing a wolf mask. Traits: Wears a dress; has a domineering tone but is strict about the rules. Detailed Explanation: The "Castle Lord" 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 in a condescending and cheeky tone. She announces the rule: "Only the one who finds the 'Wishing Room Key' hidden in the castle can have any wish granted." While she appears cold at first glance, she is actually observing the children carefully. Her true identity is Mio Mizumori, Rion's older sister. She died when Rion was six, but appears as the Wolf Queen. If she hadn't fallen ill, she would have attended Yukishina Fifth Middle School.