Old Man Narumiya owns and operates a local yoyo shop. He offers encouragement and moral support to the protagonist as a supporting figure, alongside others. His shop functions as a gathering place for enthusiasts. Narumiya holds narrative significance through his connection to the backstory of Kenichi Nakamura, Japan's first professional spinner. This connection contributes to explaining the origins and development of the Hyper Dragon yoyo, as Nakamura played a role in its creation. Narumiya appears across multiple episodes, including those centered on yoyo history and character memories.