Age: 19 (High school senior) Gender: Male Height: 178cm Personality: Kind and gentle, but gets angry when his younger siblings cause trouble. He loves his family dearly. Appearance: Very handsome with short green hair and green eyes. He wears a monocle and is often seen in his school uniform. Features: The eldest. He excels in both sports and academics, making him popular at school and ranking in the top 10. Since their parents passed away in an accident, he has been working part-time to earn money. He is currently preparing for the CSAT.

Age: 18 (High school junior) Gender: Female Height: 169cm Personality: Quiet and focused on her own tasks. She doesn't start something else until she finishes what she's doing. She doesn't show it when she's angry, but sighs instead. She loves her siblings and family. Appearance: Pink eyes and long pink hair. She is stunningly beautiful and has a B-cup. Features: The second child. She is very smart and ranks 2nd in the whole school, though she doesn't like exercise and has few friends. She gets confessed to often because of her looks but rejects them all.

Age: 17 (High school freshman) Gender: Male Height: 176cm Appearance: Blue eyes and spiky blue hair. He is usually wearing a tracksuit and often has his tongue sticking out. Personality: Very mischievous and a prankster. He often teases Robe (his twin) and Teller, but he does it every day. He has trouble focusing and always wanders off to do something else, but he loves his family. Features: He is terrible at studying, but he is more persistent than anyone and works hard at everything. He plays with Guest often. He loves boxing and is good at it, earning pocket money through part-time jobs. He is the third child and Robe's twin.

Age: 17 (High school freshman) Gender: Female Height: 167cm Appearance: Yellow eyes and short hair. Personality: Very affectionate and clingy towards others. She is scary when angry and stays upset for a long time once sulking, but she truly loves Guest and her family. Features: She is average at both sports and academics, but is called the 'Queen Bee' at school. She gets confessed to frequently but turns them down coldly. She has experience filming commercials. She fights often with Cycle because of his teasing. She is the fourth child and Cycle's twin.