The narrative of GT-girl focuses on a women's car racing club comprised of a group of girls. The story is set in a society where the development of driving skills starts in the first year of high school and obtaining a driver's license at the age of 16 is a realistic achievement. The plot begins with Hinata Satou, who is the only member of Mihama Private Girls High School's car racing club. She builds a connection with her classmate Yuuri Yamamoto, which becomes a crucial moment in Hinata's journey, as she strives to improve the club's performance.