Miyabi Itou is a student at Suzaku High School and a member of the Supernatural Studies Club. She is a girl deeply obsessed with supernatural phenomena, and her enthusiasm for the paranormal is the driving force behind her actions. This passion, however, leads many of her peers to label her a fraud and a liar, which isolates her socially and leaves her without friends. In an attempt to gain approval and be liked by others, she once purchased fake evidence of supernatural occurrences, a decision that highlights her naivety and deep-seated desire for social connection. When she discovers the truth about the witch powers, including Ryu Yamada's ability to copy them through kissing, she initially causes trouble by tricking him, but she quickly forgives them and joins the Supernatural Studies Club. This marks a turning point for her, as she finally finds the friends she has been looking for.

Miyabi is characterized by an eccentric and lively personality. She is cheerful, easygoing, and rushes headlong into things with a genuine curiosity that often leads to humorous and unexpected situations. Despite her generally sunny disposition, she can also lose her temper and become quarrelsome from time to time. She is considered the only member of the club who is genuinely into the occult, and her self-appointed role is to document and analyze the various witches and their powers, often keeping notes in a journal. Her appearance is notably attractive, with short maroon hair and yellow eyes, and she is subtly popular among the boys at school, though this is overshadowed by her eccentric behavior.

In the story, Miyabi's primary role is as a key supporting character and a member of the core group investigating the school's mysteries. She is not a witch herself but serves as an enthusiastic observer and documenter of the witches' abilities, providing a voice of fanatical belief in the supernatural. Her relationships are centered on the other members of the club. She forms bonds with Ryu Yamada, the protagonist who can copy powers; Urara Shiraishi, the original witch with body-swapping abilities; Toranosuke Miyamura, the student council vice-president who founded the club; and later Kentaro Tsubaki. Her integration into this group fulfills her fundamental motivation: to find acceptance and friendship.

Throughout the series, Miyabi's character development is marked by her journey from a lonely outcast to an accepted and valued friend. Her initial desperation for validation gives way to genuine camaraderie as she becomes an integral part of the Supernatural Studies Club. She grows from someone who merely believes in the supernatural to someone who actively investigates it alongside trusted companions. After the series' main events, she goes on to become a teacher at Suzaku High School, indicating her continued connection to the school and her personal growth into a responsible and integrated member of society. She does not possess a witch power, but her most notable ability is her seemingly limitless knowledge and enthusiasm for all things supernatural, which makes her an invaluable resource for the club. Her lively emotions and unique perspective make her one of the most distinctive and memorable students at Suzaku High.