In May 1983, Toyota's flagship model, the Corolla, was remodelled into the fifth generation (E80 series), abandoning the FR layout it had previously adopted and becoming the first Corolla model in its history to adopt front-wheel drive (FF). On the other hand, the Corolla Levin/Sprinter Treno, the sporty version of the Corolla, took a different path. Based on the platform and suspension of the previous generation Corolla Levin/Sprinter Treno (TE71), which had adopted an RWD layout, improvements were made and the fourth generation Corolla Levin/Sprinter Treno, which was different from the Corolla, was born in May 1983. This was because Toyota at the time did not know whether it would be possible to achieve the driving performance appropriate for a sports car with an FF layout, and it was judged that an RWD layout with a proven track record would be suitable for the Levin/Treno. Thus, the fourth generation Levin-Treno, named AE86, adopted a conservative and simple mechanism that was a carry-over from the previous generation. However, Toyota did not see the fourth generation Levin-Treno as merely an improved version of its predecessor. The newly developed 4A-GEU engine with DOHC 16 valves was introduced, and the body was made both more rigid and significantly lighter to ensure that its fighting power was improved. Furthermore, two types of body were available: a three-door hatchback and a two-door notchback, and several versions were available in terms of appearance and body shape, such as the front mask with square headlights for the Levin and retractable headlights for the Treno. The AE86, which was sold at a price affordable even for young people, became an unprecedented hit for a sports car. The AE86's simple mechanism, direct handling, pleasing engine response and highly controllable handling characteristics won the hearts of many motorists of the time. As a result, many tuning menus were developed for the AE86, and it was very active in motorsport events such as gymkhana, rally and racing. The AE86 also had straightforward handling characteristics that taught drivers how good or bad their driving was, so it served as a training machine for Japanese racing drivers and rally drivers. Even today, in the 21st century, the AE86's popularity is undiminished, and it continues to be driven on mountain passes and circuits as a rare sports car that transcends time and generation.

Nanako Usami, a high school girl from the small provincial city of Nagarekawa, was begged by her uncle, who works at the city hall, to take part in a stage show at the zoo to help revitalise the town. She meets her high school senior, Yukari Kohinata, who will also perform on stage. With the advice of En, Nanako successfully completes the stage show, and this leads her and En to work together as the Nagaregawa Girls, a local idol (locodoll) promoting Nagaregawa City, performing at events and appearing on cable TV, and earning a fee (1,000 yen per hour) derived from the citizens' blood tax. They began to receive remuneration (1,000 yen per hour) generated from the citizens' blood tax. The project gets into full swing when Mikoze Yui (Yui Mikoze), who is in charge of the yuru-chara 'Uoshin-kun' (fish heart) and its inside man, whose creation of a stuffed animal had been delayed, and Saori Nishifukai (Saori Nishifukai), her uncle's subordinate, join the project as its managers.

Second year high school student at Nagarekawa Third Girls' High School. She is the grandson of the former mayor of a wealthy family and is the daughter of a very wealthy family. By chance, she became a member of the Nagaregawa Girls, a local idol group that promotes Nagaregawa City. She has a very mild-mannered personality, good looks, outstanding style and excellent academics, but she has a flaw in that she is a natural idiot. She loves Nanako, a junior student at school and a member of the 'Nagaregawa Girls'.

A first-year high school student at Nagaregawa Third Girls' High School. Her uncle, a city hall employee, has begged her to become a member of the Nagaregawa Girls, a local idol group to promote Nagaregawa City. She is a serious person and her motto is to give her all in everything she does. Growing up, her dream was to become an idol.