Natsume Arisaka is a classmate of Chocolat Meilleure and Vanilla Mieux at their elementary school in the human world, and she is also a member of the school's fan club for Pierre, a popular boy. She is a short girl with light skin, blue eyes, and short purple hair. Natsume lives in a large mansion on the outskirts of the city and comes from a wealthy family. In the story, she becomes Chocolat's best friend among the human children and serves as a close companion during Chocolat and Vanilla's stay on Earth. She is generally friendly and supportive toward her friends, though she can be somewhat shy or reserved. Her hobbies include collecting Blythe dolls and reading occult novels, which reflects a taste for the mysterious and unusual. Natsume's role in the narrative is primarily that of a loyal human ally who provides a normal, everyday connection for the witch protagonists, contrasting with the magical world they come from. She does not possess any magical abilities herself, but her presence grounds the story in ordinary school life and offers emotional support to the main characters. Over the course of the series, she remains a consistent and dependable friend, though her background and personal development are not explored in great depth compared to the central characters.