Kojika Bessho is a 15-year-old student attending Urawa Third High School and serves as the vice president of the student council. She is the daughter of a local eel restaurant owner in Naka-Urawa and is a childhood friend of Saiko Numakage.

She consistently presents herself as a model honor student, but this image is supported by a strong work ethic and a tendency to push herself to the limit. Beneath her composed exterior, she is a bright and energetic individual with a lively personality. One of her specific hobbies is a strong interest in ninjas.

Her role in the story is informed by her position in the student council, which contrasts with the activities of the Railway Club. Her relationship with Numakage is a defining part of her character background. Her character highlights the gap between the perfect persona she works hard to project and her genuine diligent and spirited nature. She has long, canary yellow hair. Her motivations are driven by a desire to meet her own high standards and fulfill her duties diligently.