Naomi Tanizaki

Naomi Tanizaki's younger sister. She always wears a sailor uniform. She is openly a brocon and often clings to her brother, but it is unclear if they are actually blood-related. However, questions like "Are they really related by blood?" or "Is it okay for siblings to live together like that?" are considered taboo within the detective agency.

She does not possess any special abilities and works as a clerk at the Armed Detective Agency. However, she is quick-witted and resourceful, and Haruno has remarked that "if she had special abilities, she could become a more competent detective than her brother."

Her name is taken from a character in Jun'ichirō Tanizaki's "Naomi."