Nagahiro Sakiguchi, also known as Nagahiro the Orator and Councilman, is one of the main character. He is a third year student and the student council president of Yubiwa Private Academy, as well as a member of the Pretty Boy Detective Club.

Nagahiro is a soft-spoken and well-mannered individual, with a constant composed attitude. As the oldest of the Pretty Boy Detective Club, he is shown to be the most mature member, keeping his more eccentric companions in check, although he still has a childish spirit, as that is a requirement to be a part of the club. He is shown to be quite the intellectual and cunning individual.