Mikado Sanzenin

As the patriarch of the Sanzen'in family and an oil tycoon, this character resides in a sprawling mansion filled with numerous identical servants. He possesses a unique talent for discerning a person's true character simply through observation. Despite being Nagi's only direct relative, their relationship is strained, causing Nagi significant anxiety about visiting. He demonstrated concern for Nagi by intervening in threats, ultimately planning to pass the family fortune to someone who earns Nagi's remorse, with the assistance of Maria.