Naomi Tanizaki|

Naomi is a young girl of 16-17 years old, she has long black hair combed to one side, a "hime" hairstyle, and she has gray eyes. She also wears a school uniform with a standard white seifuku, a black and white collar, and a red tie. She wears a black long skirt that reaches to her knees, she also wears black socks that reach to mid-calf, and brown shoes. She also has a mole on her left eye.

Personality Naomi is a caring, strong-willed teenage girl who does not run away when she is involved in some business, in particular, the welfare of her brother Junichiro. She has no abilities, but she often finds herself embroiled in the conflicts of her agency, and although she is told to leave, she refuses.

Being a clerk, she is very quick-witted and quite intelligent, she almost died under dangerous circumstances. Naomi is shown to be mentally stable, and the reason she is angry is because people have been abducting ability holders, and Naomi takes it calmly and is shown not to suffer.

Ability Unlike her brother, Naomi has no abilities. However, according to Haruno, she can accurately analyze a situation to the point where she would become a good detective if she had the ability related to her intelligence. She also possesses agility, thanks to which she was able to quickly figure out how to steal car keys, as well as endurance, thanks to which she survived near-fatal injuries, protecting Junichiro with her body from attacks and attacks by Higuchi with firearms.

Not knowing what's going on with the parents, Naomi lives alone with her brother Junichiro in their apartment. To earn money for an Armed detective Agency, she works as a secretary as a high school student, and her brother works as a full-time detective.