Tokiyo Himote, 25, is the eldest of the three Himote sisters living in Nakano, Tokyo's Himote House. She maintains a generally calm and mysterious aura, though prone to unexpected bursts of intense passion. Her unspecified occupation involves extensive international travel, researching secrets of immortality across foreign countries. She frequently weaves proverbs gathered during her journeys into everyday conversation, often baffling listeners who fail to grasp the references. Her interests include photography; her birthday is September 8th and her blood type is AB.

Despite being Japanese, Tokiyo speaks with a distinctly broken Japanese cadence, adding to her idiosyncratic presence within the household. Specific personal quirks include a fascination with Senegalese wrestling witnessed abroad and a peculiar attraction to the idea of living near an active volcano, which she mentions casually. Tokiyo possesses a mysterious secret power like all Himote House residents, though this aspect receives less narrative focus.

Her role centers on her unique speech patterns, tendency to interject obscure wisdom, and capacity to surprise others with sudden fervor regarding her eclectic interests, driving many of the house's conversational dynamics.