Nanami Hiyoshi is a student at Numazu Minami High School, where she is a member of the archery club. She is the cousin of Fuuka Torimi. As an only child, Nanami deeply admires Fuuka and regards her like an older sister. Despite her youthful and gentle appearance, Nanami possesses a cool and objective demeanor, approaching situations with a level-headed perspective. Her admiration for Fuuka draws her into the world of motorcycling, and she shares in the changing joys of riding through the four seasons alongside her cousin. While her primary role is that of a supportive family member and fellow rider, her composed nature and archery discipline hint at a focused and measured personality. Over the course of Epilogue and the spin-off Four Seasons: Fuuka to Nanami, Nanami’s relationship with Fuuka deepens as they explore the pleasures of motorcycling together, though her own personal growth is subtly shown through her increasing confidence as a rider and her steady presence. She does not exhibit any supernatural or overtly exceptional abilities, but her archery training suggests good hand-eye coordination and patience.