Nanami Yasuri is a key supporting character in the anime series 'Katanagatari.' She is the older sister of the protagonist, Shichika Yasuri. Despite her frail health, Nanami possesses extraordinary martial arts abilities, far surpassing even her brother. Her calm demeanor, intelligence, and unsettling strength make her both a formidable opponent and a tragic figure in the series. Nanami’s actions and her complex relationship with Shichika have significant impacts on the story’s development and emotional themes.