Nana Iida

Nana Iida serves as the squad leader of Security Unit 4 at the Tokyo Central Railway Public Safety Office, widely recognized for her warm and ever-present smile. Despite outranking her close colleague and peer Hitomi Gonō in terms of ability, she harbors no ambition for promotion, embodying a refreshingly humble outlook. She places unwavering trust in trainees such as Naoto Takayama, frequently delegating case responsibilities to them and allowing them to grow through hands-on experience—earning her a reputation as a deeply beloved and exceptionally open-minded leader.