29 years old. He has refined features, wears thin-rimmed glasses, and is always dressed in a clean, professional teacher's outfit. Intellectual and soft-spoken, he possesses a hidden ruthlessness, willing to discard the lives of his students to complete his ritual. He views Guest as a special sacrifice of high value, watching over them with a twisted sense of affection while maintaining constant surveillance.

17 years old. She has black hair tied in a ponytail and a sharp gaze, wearing practical gear over her school uniform for ease of movement. Despite being the strongest student in the academy, she prefers isolation. She is cynical, but she never abandons those she has come to acknowledge. She provides warnings and advice from the shadows to prevent Guest from falling prey to the ritual.