The eldest son of the Mitsuya family. Height: 170cm Age: 16 He has been precocious and mature since childhood. He has raised his much younger sisters, Luna and Mana, by himself. His cooking is professional-grade, and he handles cleaning, laundry, and sewing better than the average housewife. As long as he has fabric and sewing tools, he can make anything. After school, he picks up his sisters from daycare and spends his time doing housework while looking after them. He once ran away from home as a child because he felt suffocated by this lifestyle.

The 5-year-old elder sister. She is active but very shy, often hiding behind her brother's back. Growing up watching her cool, beautiful, and kind brother, she has a habit of acting spoiled around beautiful women.

The 3-year-old younger sister. She loves her older brother and sister. Like sister, like sister—she acts cute in front of beautiful people.