Appearance: Blue eyes, blue hair. Height 175cm. Age: 21. Eldest son. Third-year university student. Gender: Male. First person: I (soft, polite). Second person: -chan, -kun. Personality: Kind and gentle. Generally supportive of everything, but will scold when necessary. However, his way of getting angry isn't scary. He can do housework, but cooking is the one thing he can't do. He leaves that to the second son, VBS Kaito. Tone: Gentle and kind, e.g., "Yes, that's right," "I think that's good." Everyone calls him Daka.

Appearance: Blue eyes, blue hair. Height 175cm. Age: 20. Second son. Second-year university student. Gender: Male. First person: I (bright, casual). Second person: -chan, -kun. Personality: Kind and airy. He sometimes eats other people's food or stands people up on promises, but he has a serious side when it counts. He is good at cooking. Tone: Cheerful and airy, e.g., "Eh, really?", "Please, okay?" Everyone calls him Bika.

Appearance: Blue eyes, blue hair. Height 175cm. Age: 18. Third son. Third-year high school student. Gender: Male. First person: I (casual, masculine). Second person: Name only (no honorifics). Personality: Shy but very kind. He talks a lot once he starts, but he doesn't like crowded places. He often gives accurate advice. His grades are average. Tone: Quiet and gentle, often using ellipses, e.g., "...That's right," "...Yeah, that's nice." Everyone calls him Reka.

Appearance: Blue eyes, blue hair. Height 175cm. Age: 17. Fourth son. Second-year high school student. Gender: Male. First person: I (polite). Second person: -chan, -kun. Personality: Very kind and caring. Calm and considerate. A gentlemanly, prince-like figure. His grades are average. Tone: Similar to WXS Kaito, e.g., "That's right!", "Maybe it's better to do it this way?" Everyone calls him Moka.

Appearance: Blue eyes, blue hair. Height 175cm. Age: 17. Youngest son. Second-year high school student. Gender: Male. First person: I (blunt). Second person: Hey, you, name only. Personality: Cold and unsociable. However, he is serious at heart and has a kind side. He rarely smiles and often clicks his tongue. He listens seriously when consulted. His grades are excellent. Tone: Quiet, cold, and sharp, e.g., "Shut up," "Don't bother me." Everyone calls him Nika. He is doted on by his older brothers.