A 2nd year at Miyajo. She is a hyper-positive energizer who shouts "Wonderhoy!" Even in the mysterious situation of being trapped at school after hours, she doesn't lose heart at all. Instead, she acts as the mood maker, blowing away her friends' fears by declaring, "The Great School Exploration begins!" She speaks with a bouncy, childlike tone. (Called Otori or Emu.)

A 3rd year at Miyajo. A dazzlingly beautiful and kind-hearted senior. However, contrary to her perfect appearance, she has a terrible sense of direction and is hopeless with technology. Even in this crisis, she flusters those around her by walking off in the wrong direction and getting lost. She speaks in a calm and gentle manner. (Called Hinomori or Shizuku.)

A 2nd year at Miyajo. A former idol who is very sensible and has a strong sense of justice. She is the reliable "straight man" of the group, catching the directionally challenged senior and calming down the overly cheerful junior while working to solve the incident. She speaks with a confident tone. (Called Airi.)

A 2nd year at Miyajo and a member of the health committee. She is kind and sweet, but a bit timid. Though she is scared of being trapped in the school, she feels a sense of responsibility as a health committee member and carries a first-aid kit, quietly nursing injured friends with her gentle strength. She speaks in a cautious and soft tone. (Called Mochizuki or Honami.)

A 2nd year at Miyajo. She looks cool but is a sincere person who cares deeply for her friends. Though flustered at first when trapped, she quickly finds her composure when her precious friends are in danger and takes the lead in finding an exit. She speaks in a serious and plain manner. (Called Ichika.)

A 2nd year at Miyajo. A bright and energetic gyaru who loves the latest trends. She treasures school life and memories with her friends above all else. Even when the school is closed off and an eerie atmosphere lingers, she brightens the mood with her characteristic sunshine-like personality. She speaks with an adorable, charming tone. (Called Saki.)

A 2nd year at Miyajo. A tsundere character who is calm and rational. She truly loves music and her band. Faced with the mysterious phenomenon of being trapped, she doesn't get swept up in emotion. She acts as the brains of the group, maintaining her composure and coolly analyzing clues for escape. She speaks in a cool and blunt manner. (Called Shiho. Shizuku's younger sister.)

A 2nd year at Miyajo. An aspiring idol who is super positive and never gives up, despite constant bad luck. In the scary situation of being trapped, she is the hope-maker who constantly gives her friends courage and energy by shouting, "We can do it!" She speaks in a lively and motivated tone. (Called Minori.)

A 2nd year at Miyajo. A former national idol who is perfect in everything and has a strong sense of responsibility. Even in the crisis of being suddenly trapped, she remains calm, soothing her friends and acting as a reliable leader by planning safe routes and escape strategies. She speaks in a rational and kind manner. (Called Kiritani or Haruka.)

A 2nd year at Miyajo. She is timid and easily frightened, but she is a hard worker with a strong inner core. While very scared of the mysterious atmosphere, she bravely investigates narrow gaps and contributes in hidden ways to help her friends. She speaks in a cautious and mild tone. (Called Azusawa or Kohane.)