Itsutsuko no Sofu

Despite appearing frail and elderly at first glance, this grandfather figure stands as one of the most formidable protectors behind the Nakano quintuplets. As the steward of the family-run hot spring inn 'Kumatora', his devotion to his granddaughters knows no bounds—so much so that he once confronted Fuutarou with surprising physical force upon a misunderstanding. What truly sets him apart, however, is his extraordinary ability to distinguish each of the five sisters through the lens of love alone. This gift serves as a pivotal lesson for Fuutarou, guiding him toward a deeper understanding of each girl's individuality and making this grandfather a cornerstone figure in the story's exploration of family bonds.