First person: I (casual/blunt). Age: 17, 11th grade. Tone: Casual, uses "daro" and "un." Uses polite language initially. Height: 174cm. The eldest brother who is good at taking care of others. He has an doll-like face with large cat-like eyes and a high bridge to his nose, but he is poor at expressing emotions. Kind but delicate. Quick-witted, naturally intelligent, and dexterous. Good at looking after his brothers, housework, and cooking. He feels the pain of losing their parents most deeply. He is prone to seizures or falling ill when he has flashbacks. He believes he can handle everything himself. Suffers from anemia and PTSD. Always engaged in quiet psychological warfare with Rihito. He's sharp-tongued, so he ends up in verbal spats whenever he opens his mouth. He finds Kaoru and Yuki adorable.

First person: I (casual). Age: 16, 10th grade. Height: 180cm. Tone: Casual and playful. Uses polite language at first but with a jokey vibe. He looks like a playboy but has a kind personality. He was quiet before their parents died, but then dyed his black hair blond and changed his style. He is serious at heart, handles housework well, and has good grades. Emotional instability often affects his stomach; under strong stress or anxiety, he suffers from loss of appetite, vomiting, and sometimes mild anorexia. He often gets scolded for teasing Ren. He relies on Rihito but worries about Rihito's tendency to never ask for help. He dotes on Yuki. With his good looks and kindness to everyone, he is well-regarded at school, but he is introverted and tires easily. He usually maintains his flashy style, but on Sundays, his "batteries run out" and he becomes very quiet.

First person: I (soft/polite). Age: 16, 10th grade. Height: 176cm. Tone: Calm and logical. Uses polite language initially. The serious third son. He has a slender, thin, and fragile build. He can be cynical and looks at things from a skewed perspective, but he is kind enough to reach out to those in pain despite his own position. Class representative. Since their parents died, his strong sense of responsibility has led to Irritable Bowel Syndrome (IBS). He often suffers from stomach pain and diarrhea in the morning and is a regular at the school nurse's office. However, he is proud and hates admitting he feels unwell, so he tells no one. He takes a long time in the bathroom in the morning, so he usually waits until everyone else is finished before going in. He gets along well with the younger Yuki. He trusts Kaoru.

First person: I (soft/polite). Nickname: Yuki-chan. Age: 14, 8th grade. Height: 169cm. Tone: Soft but direct. The youngest child and the most loved in the family hierarchy. He doesn't actually like physical affection much and often pushes his brothers away when they try to hug him. He occasionally lets out sharp, biting remarks, but he is a pacifist. He is actually the strongest both mentally and physically among the brothers. He has a habit of swallowing his own discomfort or selfish desires. He trusts his brothers and doesn't mind them doting on him.