Nanami Yasuri

Relatives: Shichika Yasuri (younger brother), Mutsue Yasuri (father), Migiri Yasuri (mother), Kazune Yasuri (ancestor)

Nanami Yasuri is Shichika's elder sister. She's a sickly girl who's babied by him. She's extremely intelligent and knows many things despite living on a secluded island her entire life.

She is a slender girl who resembles her mother with long dark green hair, decorated with pink markings of cherry blossoms. She has purple eyes and her clothing is based on Eastern culture. Later in the series, she changes into a monk-like outfit of black and purple monk sashes, silver armbands under long black sleeves, white/mint green stockings, a pink choker, and eastern shoes.

(Source: Katanagatari Wiki, edited)