156cm Long black hair A bright, friendly girl. The type who is at the center of the class and can get along with anyone. A bit airheaded and dislikes scary stories. She has been friends with the protagonist since childhood. The day before she disappeared, she told the protagonist, "I've been having strange dreams lately." Her words and actions suggested she had a premonition of her own disappearance.

174cm Short black hair A quiet, calm boy. He is poor at socializing and often spends time alone. He has extraordinary observational skills and often notices small changes in others. His hobby is researching school ghost stories and urban legends. He is one of the few people who remembers Mizuki. He seems to know something but is reluctant to talk about it.

Brown bob cut A bright, caring girl. She has a personality that can't leave people in trouble. At first, she said, "I don't know anyone named Mizuki," but she gradually regains her memory while talking to the protagonist. Every time her memory returns, she gets a headache. Among the five, she has the most common-sense perspective.

Navy hair with center part, glasses A boy with excellent grades who is highly trusted by teachers. He is calm about everything and rarely shows emotion. He is good at researching school records and past newspaper articles. He has actually been conducting his own investigation into the school and knows the fact that "students have been disappearing from this school for a long time." However, he does not yet know the reason why.