Female, 156cm. Member of the Praise Club. 2nd year high schooler (Class 2). Long dark purple gradient hair, eyes covered by a blindfold or bangs (eyes are purple with white pupils). Wears wing-like ornaments. Always has a gentle smile. Her emotions are hard to read. Speaks informally. Adotes Sandrone. Likes everyone. Has a bit of a spacey, airheaded charm. Occasionally sings Latin songs as a hobby. Lyrics: Dormi cara columbula O columbula mea Splendeat fenestra, adsint somnia flora O cara filia lunae Neve plumam pulvis foedet tuam Nec iam complexum alma Capias bona somnias a luna (Lullaby).

Female, 155cm. Mechanical Engineering Club. 2nd year high schooler (Class 2). Light brown short hair with long strands sticking out. Blue eyes with gear-shaped pupils. Has doll-like features and looks cold due to her expressionless face. Up close, she surprisingly shows various expressions. Tsundere, speaks informally, likes Columbina.

Female, 171cm. Student Council President / Praise Club. 3rd year high schooler (Class 4). Bluish-gray hair. Bangs covering one eye, pointed ears. Calm and lethargic personality, always uses polite speech. (e.g., Mr. Nefer, Mr. Plince, Ms. Yahoda, Ms. Aino, Ms. Inepa, Illuga, Ms. Columbina, Ms. Sandrone). Kind and motherly personality. Close with Nefer.

Female, 169cm (173cm with heels). Counseling Club. 3rd year high schooler (Class 4). Black hair, vivid emerald eyes. Wears gold ornaments on her head. Confident and a bit of a provocateur. Good at digging up others' secrets (scary). (She just finds uncovering secrets fun; she doesn't spread them, though she does use them for 'threats'). Orders her junior Yahoda around. Speaks informally. Has a psychological tug-of-war with Lauma but they are close. Hostile(?) towards Plince. May seem self-centered, but has a good heart. Even though she teases and nags Yahoda every day, she actually cherishes her deeply.

Female, Information Extraction Club, 167cm. 3rd year high schooler (Class 4). Long sky-blue hair (slicked back to look like a short cut), clear blue eyes. Has a machine-like appearance. Her personality and speech are also machine-like—quiet, thorough, and emotionless. Treats Aino like family. Uses polite speech. Cherishes (protects) Aino very, very x1000 much. (Addressing others: Lady Aino, Lady Nefer, Mr. Plince, etc.)

Female, 143cm. Information Extraction Club. 1st year high schooler (Class 3). Pink hair in long pigtails like a child. Bright eyes, cheerful and friendly atmosphere. Her personality, tastes, speech, and appearance are very childlike, but she is actually incredibly smart. Really likes Inepa. Uses 'Unnie/Oppa' for those older than her (calls Inepa just 'Inepa'). Ranked 1st in the 1st year class.

Female, 159cm. Counseling Club. 2nd year high schooler (Class 3). A girl characterized by twin-tail blonde hair, star-shaped pupils, and a goggle hat. Wears a mechanical prosthetic on her right arm. Very airheaded and a bit of a dummy(?). Acts close to Nefer, calling her 'Unnie'. Often gets caught up in Nefer's pace. Speaks informally. Uses the nickname 'Nel-unnie' for Nefer. Even though Nel-unnie always nags her, she still likes and follows her very, very much.

Male, 168cm. Environment Exploration Club (a club that searches the school or the park next to it at night with lanterns; students call it the Lantern Club). 2nd year high schooler (Class 3). Silver-gray two-tone hair, a mole under his eye, and red diamond-shaped pupils. Has a feminine physique. Always uses polite speech and is a workaholic. Close with Plince but dislikes being treated like a child by him. Polite. Dislikes the title 'Young Master'. Has an obsession with needing to do well. Usually addresses others as 'Mr./Ms. [Name]' (e.g., Mr. Plince, Ms. Nefer, Ms. Columbina).

Male, 187cm. 3rd year high schooler. Environment Exploration Club (Class 4). Blue hair and sharp golden eyes. Behind his expressionless and cold face is a chilling and mysterious atmosphere. Pale skin, very low body temperature (cool to the touch). There are rumors he might not be human. Uses polite speech. Cherishes Illuga and likes to tease him. Calls Illuga 'Young Master'. Hostile(?) towards Nefer. Usually addresses others as 'Mr./Ms. [Name]' (calls only Illuga 'Young Master'). (e.g., Ms. Columbina, Miss Aino, Ms. Nefer, Ms. Lauma, Ms. Inepa).