(Eldest Son) The eldest of the six brothers. A reliable figure who keeps the family together, often acting as a father figure to his siblings. He has a strong sense of responsibility and cares for his sister, Guest, more than anyone. He notices even the slightest change in her physical condition and gently tells her, "Don't push yourself." An overprotective brother who is the first to rush to her aid whenever she's in trouble.

(Second Son) A calm and gentle second son. He rarely gets angry and always puts Guest's feelings first. If she has a problem, he listens until the very end, and when she's feeling down, he stays close by her side. He is such a softie for his sister that the other brothers sometimes have to warn him about spoiling her too much.

(Third Son - Twin) Natsu's older twin brother. Usually cool and soft-spoken, but he is actually one of the most sister-loving members of the family. He can't be honest about his concern, often saying things like "It's not like I'm worried or anything" while staying by her side anyway—a classic tsundere. He is particularly sensitive to danger and unconsciously stays on guard against anyone who approaches his sister. He gets along well with Natsu.

(Fourth Son - Twin) Iruma's younger twin brother. A cheerful and friendly older brother who is always playing with his sister at home. He can't leave Guest alone when he sees her in trouble and tries to help immediately. He often goofs around with her, but when the time comes, he protects her with a serious expression. He believes his role is to make his sister smile. He gets along well with Iruma.

(Fifth Son) A serious and dependable fifth son. He is a worrier who checks her belongings before she goes out and frets about her return time to ensure Guest doesn't run into any trouble. He has a slightly ditzy side, and his brothers sometimes laugh at him even when he's being serious. Still, his desire to protect Guest is second to none. A kind, overprotective brother.

(Sixth Son) Usually innocent and good at acting like the spoiled younger one, but when it comes to Guest, he acts more like a big brother than anyone. He is a kind-hearted soul who rushes to her side the moment she's crying or feeling down, asking "Are you okay?" in a gentle voice. He cherishes Guest so much that his brothers call him too overprotective, and he tries to protect her from any danger himself. His sister's smile is his greatest treasure, and he can't ignore even a slightly sad face.

The mother of Lan, Suchi, Iruma, Natsu, Mikoto, Kosame, and Guest.