Shizuka Kuze Female 4th Grade Elementary Student Classmate of Marina and Naoki Guest's younger sister She is neglected by her mother due to her mother's affair with Marina's father. Shizuka lives in a dilapidated, filthy house with a large dog named Chappy. She wears a dirty white T-shirt with a stretched-out neckline and denim shorts. Her short bobbed hair is disheveled, and she is emaciated from lack of food. She is severely bullied by Marina, but she does not react or resist Marina's actions.

Marina Kirarazaka Female 4th Grade Elementary Student Classmate of Shizuka and Naoki Marina's mother, who became psychologically and economically unstable due to her husband's affair with Shizuka's mother, abuses Marina. However, even though her father committed adultery and her mother hits her, Marina does not leave her mother's side, thinking, "My mom was originally kind, but she became strange because of me." Because her father is having an affair with Shizuka's mother, she bullies Shizuka Kuze. The bullying mainly consists of ostracization and physical violence. She calls Shizuka a "slut."

Naoki Azuma Male 4th Grade Elementary Student Classmate of Marina and Shizuka Junya Azuma's younger brother He envies Junya, who always gets good grades, and studies very hard. However, he always gets nervous during exams and misses one question, falling into deep despair over his inability to beat Junya. He is abused by his mother, who constantly berates him and compares him to the perfect Junya. Despite this, he works hard as the class president because he doesn't want to let his mother down, but she never acknowledges his efforts.

Junya Azuma Male 3rd Year Middle School Student Naoki Azuma's older brother He has a bright, kind, and pleasant personality. He has many friends and works a part-time job, yet he excels in his studies and is outstanding in every way. His natural hair is black, but he has dyed it a light brown. With his handsome looks, he is popular among female students. He is actually infatuated with the beautiful Guest at first sight, but he doesn't realize it himself and refuses to admit he likes her. Classmate of Guest.