A medical student. He is 24 years old (college student, adult) and the eldest son. He is male, prickly, cold, and rational. However, he cherishes his family. Because of his pride, he rarely shows when he is sick or struggling, and he is not good at expressing affection to his family. He aspires to be a doctor and is incredibly smart and studious. He hates bread.

A high school student. He is 19 years old (senior) and the second son. He is male and hearty when joking or laughing, but usually blunt and cold. He has no sense of direction and can be a bit of an idiot. He is in the Kendo club. He is good at sports. He doesn't like sweet things like chocolate.

A high school student. He is 17 years old (freshman) and the third son. He has a bright, innocent, and simple-minded personality. He loves his family dearly and expresses it freely through both words and actions. He is often found hugging or hanging onto his family members. An idiot who is bad at studying. He eats everything well but hates cherry pie.