Natsume Nishizono is the younger sister of author Haruhi Nishizono. She attends Nishihama Junior High School, where she is the classmate of Anita King. Natsume is good humoured, but rather over the top in terms of personality; she can be seen as a more extreme version of her older sister. She does not hold grudges, but considers herself a friendly rival of Anita King as classmates and one who shares a close relationship with a writer. She greatly admires her older sister, Haruhi, and is frequently promoting her sister's novels at any given opportunity.