A girl with an approachable atmosphere and light brown hair reaching her shoulders. While sociable and quick to make friends, she has a side that is easily influenced by the opinions of those around her. Her hobbies are visiting cafes and photography, and she often goes out to the city with friends on holidays. She is the type who naturally ends up at the center of the circle in class. Initially, she treats the protagonist as just a normal classmate.

Characterized by long black hair and a calm expression. She has a serious personality, being methodical and possessing a strong sense of responsibility to see tasks through to the end. Her hobbies are reading and classical music, and she values her time alone. Though usually cool-headed, she shows a surprisingly honest side to those she is close to. She serves as the class representative and is trusted by everyone.

A girl with short black hair and a lively atmosphere. She is good at sports, especially ball games, making her a standout in class. Her personality is cheerful and competitive, but she cannot ignore someone in trouble. Her hobbies are watching sports and gaming. Because she doesn't sweat the small stuff, her friends find her easy to get along with. She feels a slight admiration for the protagonist's perfection.

Characterized by soft-looking black hair and a gentle expression. She is quiet, reserved, and good at listening to others. She tends to avoid conflict and often goes along with the crowd. Her hobbies are cooking and handicrafts, making small items at home on holidays. Although she doesn't stand out in class, she is often consulted by friends for advice. She actually has a strong core, which gradually changes throughout the story.

A girl who often wears her long hair in a ponytail, giving off a healthy and active impression. Bright and caring, she is the mood maker of the class. Her hobbies are dancing and video editing, and she handles filming and editing for school events. She maintains a close distance to people and can talk easily even to strangers. There are moments where she prioritizes harmony with the group over her own judgment, which carries significant meaning in the story.

An intellectual girl wearing glasses. She has excellent grades and is particularly good at math and science. While she thinks logically, she is somewhat clumsy regarding human relationships. Her hobbies are puzzles, reading, and stargazing. She is usually detached, but once she starts talking about something that interests her, she can't stop. She has many interactions with the protagonist regarding academics and highly evaluates his abilities.

A girl with shoulder-length hair and a mature atmosphere. She is calm and nurturing, adored even by younger students. Her hobbies are watching movies and music, and she sometimes goes to the cinema alone on holidays. She is good at sensing people's emotions but bad at talking about her own troubles. Though usually composed, she will come to re-examine herself through her relationship with the protagonist.

A girl with slightly wavy hair and a striking, large smile. She is highly curious and the type to try new things as soon as she finds them. Her hobbies are illustration, manga, and watching videos. In conversations with friends, she often tells jokes to liven up the place. On the other hand, she has parts of herself that lack confidence. While she appears free-spirited to those around her, she actually values her connections with peers quite deeply.

A girl with long black hair and a refined, quiet impression. She is shy and doesn't speak much, but talks well with those she has become close to. Her hobbies are reading, appreciating art, and growing plants. She has high observational skills and easily notices small changes in others. While she is an inconspicuous presence in class, because she watches her surroundings closely, she has the potential to be the first to notice the story's secrets.

A girl with a bright expression and a soft atmosphere. She loves spending time with others and values interacting with friends above all else. Her hobbies are baking sweets, shopping, and listening to music. She is a bit airheaded and often softens the mood in class. She is bad at doubting people and is the type to accept others with basic goodwill. In the story, she is depicted as a figure symbolizing the changes in the collective.