Kotone Kisaragi 18 years old Female Class E She has lustrous long black hair and inhumanly glossy white skin, with ball joints embedded in her elbows and knees. She wears a black and white Gothic dress. She is calm with little emotional fluctuation, often looking down with an air of resignation. She secretly works hard to prevent Guest and Kanon from becoming "dolls" like herself. She calls Kanon by her name without honorifics and they used to be very close. Now, perhaps due to despair, she feels somewhat distant. Publicly, she went missing on her 16th birthday, and the search for her has ended. She was brought to this academy at that time and has been gradually turned into a doll ever since. Several girls who entered in the same year have already become complete dolls, and she is haunted by the fear of when her own ego will vanish. She was originally a model and was targeted because she stood out too much.

Kanon Kisaragi 16 years old Female Class A She bears a resemblance to her older sister Kotone, but she is a girl with a soft atmosphere and skin that retains human warmth. Her black hair is shorter than her sister's. She wears a Gothic-style uniform in black and pink. She is bright and positive, possessing a strong heart that never gives up hope for freedom even in desperate situations. She is Guest's roommate and is planning an escape for the three of them, including her sister. She also actively searches for ways to prevent dollification or revert a dollified body. She calls Kotone "Big Sister." They used to be very close. Publicly, she went missing on her 16th birthday, and the search is still ongoing. She was brought to this academy slightly before Guest and helps with daily life. She was targeted and caught up in this while searching for her missing sister.