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Uesugi-kun, you've really done it this time. However, I will not hand my daughters over to the likes of you.
|― Papa Nakano's monologue.|
Maruo Nakano (
Nino remarks that Maruo always do thing he deems as correct.
Ebata is the Papa Nakano's secretary and occasionally driver. Due to Papa Nakano's lack of time and attention towards his stepdaughters, Ebata is assigned to take care of the quintuplets.
Fuutarou's father, Isanari, somehow has a relationship with Papa Nakano prior to the beginning of the series. Through Isanari, Fuutarou was able to land the job as the quintuplets' private tutor.
Despite choosing Fuutarou as the quintuplets' private tutor, Papa Nakano bears a certain hatred toward him. He denies Fuutarou and objects him marrying one of his daughters.
While Maruo is not the quintuplets' biological father, he genuinely cares for his stepdaughters. This is shown in his decision to hire Fuutarou, the best student in class, as his stepdaughters' tutor, despite disliking him. He also doesn't force his opinions and decisions on the quintuplets. When the quintuplets decide to move out from their residence to live independently, Maruo becomes displeased. Even so, he still considers their thoughts and allows them to do so.
- "Ebata, it's such a joyous occasion for all of my daughters to clear their exams. I wonder if I'm smiling? I see. As their father, that's a given."
- "It seems that my responsibilities as a parent include listening to my children's selfish wants"