Iyo holds the position of Fourth Hand in the Group of Ten, a Kyushu-based organization under the Dazaifu Central Bureau dedicated to establishing Kyushu's independence and averting another Great Destruction. Petite with blue hair, Iyo's most striking feature is the red ribbon tied to resemble bunny ears. She typically wears a red yukata over a white gi, making her the second shortest member of the group, taller only than Nene Minamoto. Shy and often reluctant to speak, Iyo harbors deep romantic feelings for Eiji Hoshimiya, placing her in rivalry with Rin Kurenai. Her devotion drives her to confess directly to Eiji, even disrobing to underscore her sincerity. Her primary ability, "Star Seeker" or "Divination," grants her accurate foresight. This power proves strategically vital, enabling her to locate Eiji Hoshimiya and later reassure him with favorable signs during the Yamaguchi meeting. A unique trait centers on her red ribbon: contact by any man triggers immediate pregnancy, causing her belly to swell rapidly to full term, leading to imminent labor and potential permanent loss of her divination ability. If childbirth is prevented, the pregnancy reverses, the baby disappearing from her womb. Eiji inadvertently triggers this condition during an encounter. Iyo participates in key Group of Ten events: meetings identifying Eiji as a candidate; congratulating him after his trial; the disclosure of the Kyushu independence plan; witnessing Eiji bind the group within his territory; the Yamaguchi meeting against the Heavy Rock Star Order User. She experiences profound distress during a teleconference as the Japanese government executes the relatives of the Group of Ten in Tokyo. Originally designated "Subject #23" of the Hoshimiya Agency, details of her early life or recruitment into the Group of Ten remain undisclosed.