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Grandfather (tentative name) is the maternal grandfather of the Nakano quintuplets and the father of Rena Nakano. He is the manager of the Toraiwa Hot Springs inn.[no citation]
He later fell ill and passed away about three years after the main story and therefore could not attend his granddaughter's wedding with Fuutarou Uesugi.
The grandfather in the last picture ever taken with his granddaughters.