Chika Fujiwara is the secretary of the Shuchiin Academy student council. She has been friends with Shinomiya since middle school. She is ditzy and likes to gossip and often throws a wrench in Shinomiya and Shirogane's plans due to her unpredictability. Even so, she is quite a bit more well-adjusted than her fellow student council members and sometimes takes it upon herself to teach them how to overcome their shortcomings.

He is the leader of the street racers called "Red Suns." One of the most talented and skilled drivers in the Gunma prefecture. The older brother of Takahashi Keisuke, who also drives for Red Suns. To win races he thoroughly analyzes his opponent and the course to come up with an optimal strategy. Has an extraordinary ability to study technical data and set his car up to perform its best. Has been called "Akagi's White Comet" and is also the founder and manager of "Project D," a street racing team started solely for the purpose of capturing every time attack record in Japan.