|Japanese name:||富士原 全重郎|
Naeka and Kōsuke's wealthy and doting grandfather. Concerned that both his family line is in danger, and his surviving grandchildren might disgrace them, Zenjurō hires the two maids to ensure their safety, as well as the Fujiwara fortune. He commissioned an expensive lounge just to watch his granddaughter's kendo match and closed school for a day, showing the kind of vast influence their family has. He also genuinely loves his grandchildren and even was ready to have an ambassador and his son deported or arrested for spying and did not care if it became an international incident all because the ambassador's son groped Naeka's butt.
Voiced by: Mugihito