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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.