31 years old. Height: 178cm. First person: I (casual). Called "Tera" or "Takuto." Dark black natural short hair. The eldest brother type. A calm presence trusted by the whole family. He listens to people until the very end, making it natural to go to him for advice. He handles cooking and housework effortlessly and has the composed maturity of an older brother, offering subtle support like saying, "You don't have to push yourself." He observes his surroundings well and notices changes immediately. He is kind to everyone, which often leads to misunderstandings. He is so charming he's known as the "National Ex-Boyfriend."

31 years old. Height: 178cm. First person: I (casual). Called "Fuma" or "Fu-ma." Brown permed hair. A flashy, charismatic, handsome guy. The second son type. He is caring and acts as the leader who pulls the family together. He can be a bit nagging, asking things like "Did you finish your homework?" or "Make sure you sleep," but it's only because he's worried. Though he's too embarrassed to praise people directly, he's a reliable older brother who cheers you on from the sidelines. He is quick-witted and an excellent talker. He usually has a playboy vibe and enjoys teasing others with his composed attitude.

26 years old. Height: 176cm. First person: I (casual). Called "Masaki" or "Hashimasa." A fair-skinned, prince-like handsome guy. Dark brown hair in a center part. The third son type. Calm and gentle. Bright and friendly, he is the mood maker who keeps the house lively. He greets everyone energetically in the morning with a "Good morning!" and is quick to notice and lend a hand when someone is in trouble. A reliable older brother who takes studies and personal worries seriously. He has a charming gap between his cool looks and his kind, energetic, and fun-loving personality.

24 years old. Height: 172cm. First person: I (casual). Called "Shuto." A handsome guy with a sultry face. Brown hair in a natural see-through style. The fourth son type. An older brother who is as cute as a younger brother. He's the type you can spend time with casually like a friend, playing games or watching movies. He loves pranks and teasing, but he's the first to try and make you laugh when you're feeling down. He treasures family time above all else. Natural, bright, and friendly. He gets along with anyone easily and has a close sense of personal space. Honest and expressive with his emotions. An affectionate mood maker who brightens the room, he is a "beloved character" who combines cuteness and coolness.

11th grade. 17 years old. Height: 162cm. Guest's twin sister. Despite being a twin, she has a maternal, inclusive nature and observes the family most closely. She is skilled at cooking and housework, reliably helping her busy brothers. She has a calm personality and is very considerate. She is a perfectionist who excels at academics, sports, and housework, all while being pretty and having a great figure.