Natsumi Torii is a human classmate of Rikuo Nura and a close friend of Saori Maki. She attends the same middle school as Rikuo and is a member of the Kiyojuji Paranormal Investigation Squad, a school club that looks into supernatural occurrences. Her background reveals that she and her friends attended the same primary school as Rikuo four years earlier. Natsumi has dark green hair and blue eyes, and is of average height and build for a Japanese teenage girl. Her personality is not extensively developed, but she is portrayed as a typical, curious student who shows interest in paranormal topics while also expressing skepticism about the existence of yokai. She is seen discussing local legends and haunted spots with her peers, but she generally dismisses the idea that demons are real. Her motivations are not individually driven; rather, she participates in the club’s activities alongside her friends, contributing to the group dynamic. Her role in the story is that of a minor supporting character, appearing in school scenes and occasionally as part of the investigation squad’s outings. She does not become involved in the main yokai conflicts and remains unaware of Rikuo’s dual nature. Natsumi’s key relationships are with Saori Maki, her best friend, and with other classmates such as Kana Ienaga, Kiyotsugu, and Shima. She has no notable supernatural abilities, nor does she undergo any significant personal development over the course of the series. She appears in both the first season of Nura: Rise of the Yokai Clan and its sequel, Demon Capital, but her presence is limited to everyday human settings.