Nana's Sister is an unnamed character that briefly appeared in the Kemono Friends: Yokosou Japari Park e! manga. She's the younger sister to Nana the caretaker and asks her about her tough first day at work.

She lives together with her sister in the employee apartments within Japari Park's city area. She doesn't play a large role in the manga, to the point where she doesn't even show up at the party that the park's Friends threw for Nana. She doesn't appear in any other media to date.