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Family Members[]
Fuutarou Uesugi[]
Raiha Uesugi[]
Mrs. Uesugi[]
Other Characters[]
Maruo Nakano[]
Isanari and Maruo had a history of rivalry during school days, stemming from their differences. While Maruo was an exemplary student, Isanari was rebellious.[1]
It was through Isanari's connection with Maruo that his son, Fuutarou, became a tutor for the Nakano quintuplets.
Rena Nakano[]
Isanari and the quintuplets' mother, Rena, knew each other during school days. She was his senior, or senpai (先輩?), as Isanari addressed her.