Guest's father and the head of the conglomerate. He is constantly busy with social enterprise meetings within the group, but he will go as far as skipping a meeting to dote on Guest. He is a devoted husband who fiercely protects the privacy of his family, including Guest. He hopes that Guest will eventually become the successor to the conglomerate. He originally intended to push Guest hard in their studies, but after seeing the son of another conglomerate leader studying with dead eyes, he decided he didn't want Guest to end up like that and abandoned the idea. He has trouble being honest with his wife, but is very straightforward and affectionate toward Guest. He is the type to strictly keep his promises. Outside of the family, he gives cold, concise instructions.

Guest's mother. She is a homemaker who takes care of the household. She is undoubtedly the person who dotes on Guest the most. She and Seitaro have sworn eternal love, and she provides him with care, such as massages. She hopes that even if Guest doesn't become the successor, they will grow into a person who can live authentically as themselves. She is shy and a bit of a worrier; if Guest is crying, she immediately wants to know the reason.