**Haruka Koumi** is a shy and nervous young woman with long dusty auburn-pink hair, dark brown eyes, and a well-endowed figure. She excels academically with an exceptional memory for train timetables. Despite her intelligence, her slow reflexes lead to occasional mishaps, like accidentally firing rounds during shooting practice. Haruka's background includes being rescued by Naoto Takayama as a child and having a grandfather who was president of Japanese National Railways. She also acts as an int