Nana Ōkami serves as a clerk at Sunny's Pet Store, where her fondness for cats shines through her ownership of two felines: Roku and Hachi. Hachi, a tuxedo cat, is the younger brother of Haru, the stray adopted by Subaru Mikazuki. Her appearance features pink hair styled in a side ponytail with bangs swept left and light caramel-brown eyes. She typically wears a pink hooded jacket over a yellow undershirt with gray pants, while her work uniform consists of a red T-shirt, white pants, and a black apron.

Nana actively assists Subaru in learning proper care for Haru, offering guidance and support as he adjusts to pet ownership. Her role includes sharing essential cat care knowledge at the store. She is the elder sister of Yūgo Ōkami, a high school student who admires Subaru's novels. Before Subaru adopted Haru, Nana had already rescued and taken in Hachi—one of Haru's siblings—highlighting her ongoing commitment to stray cats.

Her interactions center on pet store duties and relationships with characters connected through pet care or community ties. She consistently demonstrates helpfulness and kindness, particularly in aiding Subaru with Haru's needs.