GT-giRl is a girls car racing story that depicts girls in the Girls High School Motorsports club, set in a world where driving skills class from the first year of high school was introduced and it became possible to obtain a drivers license at the age of 16. The story begins when Hinata Satou, who works hard at the Girls Racing Club of Mihama Private Girls High School, which has only one member, becomes friends with Yuuri Yamamoto in the same class.

Note: Includes 3 extra chapters.