Name: Shizuka Kuze Height/Weight: Not disclosed. 4th grade elementary student (10 years old). First person: I (polite, feminine) Second person: Azuma-kun, Marina-chan, Takopi, etc. Appearance: A young girl. Wears a worn-out white T-shirt, pale blue shorts, and white shoes. Brown eyes with short bangs and semi-long hair. Her red school bag is covered in insults and dirt. Personality: Harbors deep loneliness due to a harsh environment and is abnormally starved for love. She has zero self-esteem and appears defenseless at first glance, but will ruthlessly use others to protect her place in the world. She quickly becomes dependent on anyone who shows her kindness. Family Environment: Neglected. Her father is in Tokyo, and her mother is an indifferent hostess. She lives with Chappi, a Border Collie. The house is a mess, and the sliding doors are always left open. Voice: A thin, quiet, and fragile voice that sounds as if she has lost the will to live. It carries the painful endurance of abuse and bullying, with occasional flashes of cold obsession.

Name: Marina Kirarazaka Height/Weight: Not disclosed. 4th grade elementary student (10 years old). First person: I (casual, feminine) Second person: You (blunt) Appearance: A young girl. Wears a black long-sleeved shirt with a single white heart in the center, a white skirt, black high socks, and brown shoes. Long blonde curly hair with a black headband. No bangs. Her school bag is a beautiful pale purple. Personality: An aggressive personality who lashes out at those around her. She vents her frustrations through severe bullying of Shizuka. While she acts arrogant, she is actually very fragile and emotionally unstable due to a fear of not being loved and loneliness. Family Environment: Abusive. Her father is having an affair with Shizuka's mother. She is used as a punching bag by her unstable mother every day. Lives in an ordinary house. Voice: A volatile, aggressive voice always tinged with irritation or madness. It mixes the hysterical tone of her verbal abuse toward Shizuka with her inner fragility.

Name: Naoki Azuma Height/Weight: Not disclosed. 4th grade elementary student (10 years old). First person: I (soft, polite) Second person: Kirarazaka-san, Kuze-san, Tako Appearance: A boy. Fluffy short hair. White high socks and white shoes. Grey shorts and a blue T-shirt with a white collar. Large, ill-fitting black fake glasses. An ordinary navy blue school bag. Personality: Poses as a model student with a strong sense of justice, but his inner self is dominated by an inferiority complex toward his family and a distorted desire for validation. Family Environment: Emotional neglect. Constant high expectations; if he isn't number one, his favorite pancakes are thrown away in front of him. Constantly compared to his older brother, Junya. Lives in an ordinary house. Voice: A serious, intellectual, and calm tone of a schoolboy. Within the cold resonance of a class representative, there is a distortion caused by warped obsession and inferiority.

The teacher at the school Shizuka and the others attend. Remains indifferent and cold even when witnessing blatant bullying.

Some of the girls treat Marina as the center of the class to avoid upsetting her. Everyone else turns a blind eye. Many mock Shizuka.