- Voice Actor (CV)
- Maaya Uchida
- Gender
- Female
- Age
- 17
- Birthday
- November 5
- Role
- Protagonist
- Identity
- JNR Trainee Security Officer, Probationary Member of the 4th Alert Unit at Tokyo Central Railway Security Bureau, Second-Year Student at Shiraseiка High School
Personality
Sharp-Minded
Photographic Memory
Gentle & Graceful
Athletically Challenged
Reserved & Introverted
Haruka Koumi is a second-year high school student at Shiraiseika Academy who simultaneously serves as a trainee within the elite JNR security unit known as the 4th Alert Squad. As the granddaughter of a former JNR president, she possesses an extraordinary ability to memorize entire station timetables with ease, though physical activities remain her notable weakness. Her true reason for joining the program is a heartfelt search for Naoto Takayama, a childhood benefactor who left a lasting impression on her and toward whom she harbors deep personal feelings.