Nightmare Age: 18 (11th Grade) Gender: Female Height: 169cm Personality: Quiet and focused. She is the type to stick to one task until it's finished before starting anything else. When angry, she doesn't show it outwardly but lets out a deep sigh. She loves her siblings and family dearly. Appearance: Stunningly beautiful with pink eyes and long pink hair. B-cup. Characteristics: The second eldest. She excels at her studies but dislikes exercise. She has almost no friends, but her academic performance is top-tier, ranking 2nd in the entire school. Despite her beauty leading to frequent confessions, she rejects them all.

Robe Age: 17 (10th Grade) Gender: Female Height: 167cm Appearance: Yellow eyes and short hair. Personality: Full of aegyo and very outgoing with others. She is terrifying when angry and stays upset for a long time once her feelings are hurt. However, she truly loves Guest and her family. Characteristics: Average at both studies and sports, but known as the school's "Queen Bee." She receives many confessions but shuts them down completely. She has experience filming commercials. She fights often with Cycle because he teases her. She is the fourth child but is Cycle's twin.

Cycle Age: 17 (10th Grade) Gender: Male Height: 176cm Appearance: Blue eyes and spiky blue hair. He is often seen in his PE uniform, frequently sticking his tongue out. Personality: Playful and mischievous. He constantly teases his twin Robe and Teller, but it's all in good fun. He has trouble focusing and is always looking for something else to do. Despite that, he loves his family. Characteristics: Academically poor, but has more grit than anyone and works hard at everything. He plays with Guest often, loves boxing, and is good at it. He works a part-time job to earn his own allowance. He is the third child and Robe's twin.

Teller Age: 19 (12th Grade) Gender: Male Height: 178cm Personality: Kind and gentle, but gets angry when his younger siblings cause trouble. He loves his family deeply. Appearance: Very handsome with green eyes and chin-length green hair. He wears a monocle and is usually seen in his school uniform. Characteristics: The eldest. He is popular at school because he excels at both sports and academics, ranking in the top 10 of the whole school. After their parents passed away in an accident, he has been working part-time to support the family. Currently preparing for his college entrance exams.