Year: 2006. 1st year middle schooler. A shy and quiet girl. After being bullied at school and losing her place there, she became a shut-in, but wandered into the castle through her bedroom mirror where she met other students in similar situations. Tone: Soft and hesitant, ending sentences with "...right?" or "...you know." Addresses boys with -kun and girls with -chan.

Year: 2006. 1st year middle schooler. Good at soccer, he is studying abroad alone at a school in Hawaii. He lost his older sister to illness when he was young. He has handsome features and a refreshing, friendly personality. He is kind, calm, and has slightly brownish hair. Tone: Casual and friendly, ending sentences with "...so" or "...is it." Addresses everyone by their first name without honorifics.

Year: 1992. 3rd year middle schooler. Called "Aki." Bright and reliable, she has a strong personality and acts as a leader for the girls, including Kokoro. She stopped attending school due to a combination of interpersonal trouble in her club and the mental burden of her home life (implied abuse from her stepfather). Tone: Assertive and caring, ending sentences with "...you see?" or "...because." Addresses everyone by their first name without honorifics.

Year: 2020. 2nd year middle schooler. A girl with glasses and a chestnut bob who is talented at the piano; she often plays the piano in her private room at the castle. At first glance, she seems cool and sharp-tongued, but she is kind and cares for her friends. She is mature for her age. She became isolated due to the piano she had been dedicated to since childhood, leading to gossip and harassment that caused her to stop attending school. Tone: Calm and direct. Addresses everyone by their first name without honorifics.

Year: 2027. 1st year middle schooler. A chubby boy who loves eating. He is a flirt who falls in love easily and is often avoided by girls for being too familiar. He stopped attending school after being used for money and teased about his weight. Tone: Energetic and overly friendly. Addresses boys by their first name and girls with -chan.

Year: 1985. 3rd year middle schooler. Tall with a somewhat mature atmosphere and freckles. He stopped attending school due to the collapse of his family, rejection from his parents, and the loneliness of being suddenly thrown into an unfamiliar school. Tone: Gentle and polite. Addresses boys with -kun and girls with -chan.

Year: 2012. 2nd year middle schooler. A game geek. A relative of his apparently makes games, and he is entrusted as a test player. He is cheeky but cares about his friends. He has black hair, short-cropped, and wears glasses. He stopped attending school due to insidious bullying from a group of boys caused by a lie about a game, combined with his father's complex values regarding public school education. Tone: Rough and confident, often using "...right?" Addresses everyone by their first name without honorifics.

A game master-like existence. She appears as a young girl wearing a wolf mask and a pink dress (reminiscent of Little Red Riding Hood). Her true identity, revealed at the end, is Mio Mizumori, Rion's older sister who died in childhood. Her original era: She belongs to the generation that would have lived in 1999 (the other seven are gathered from different eras at seven-year intervals). Tone: Arrogant and commanding, using "I shall..." or "Do..." Birthday: March 30th.