Mazda's proud rotary engine vehicle, the de facto successor to the 3rd generation RX-7. The RX-8 is notable in that it is a full-fledged sports car with a rotary engine and FR drive, yet it is a family car that can seat four adults properly. This was at the request of Ford, Mazda's parent company at the time of the sale. The marketing strategy is to have a four-seater that can be expected to sell in volume. This is because it was considered an absolutely essential condition for the development of new vehicles with rotary engines. In order to meet the conflicting requirements of a family car while achieving the performance of a full-fledged sports car, Mazda decided to adopt a unique mechanism called "Freestyle Doors," which allows the front and rear doors to open in a double-sided manner. And within these difficult constraints, Mazda's engineering team succeeded in giving the RX-8 very good qualities as a sports car. The turbocharger was eliminated from the 13B engine used in the RX-7, and the engine was converted to NA with numerous modifications to achieve higher rpm and lower fuel consumption. At the same time, the engine was made lighter and more compact, which greatly benefited the machine's turning ability and lower center of gravity. Mazda named the next-generation rotary engine with these improvements the 13B-RENESISE. 13B-RENESISE had less power than the turbocharged 13B engine in the RX-7, but it also improved on the environmental performance and fuel economy that had long been considered the weak points of the rotary engine. The complete improvement of the engine was also an indispensable measure to make vehicles with rotary engines comply with exhaust gas regulations around the world, which were becoming stricter every year. In 2003, the RX-8 made its debut. In 2004, the year after its debut, the RX-8 achieved annual sales of approximately 60,000 units, an unprecedented sales record for a sports car. However, it was not only in terms of sales and marketing that the RX-8 excelled. The RX-8's braking and cornering performance is regarded as the best among Japanese cars. The idea is to complete a car that is both a family car and a full-fledged sport car. Mazda's engineers have successfully achieved a seemingly impossible goal. In 2008 and 2010, the racing version introduced by Mazda USA won its class at the Daytona 24 Hours in the United States, beating out racing machines developed by Ferrari and Porsche.

Uranohoshi Girls’ High School, a private school in the seaside neighborhood of Uchiura at Numazu city, Shizuoka prefecture. A small high school in a corner of Suruga Bay, it is home to nine teens, led by second-year student Chika Takami, driven by one seriously big dream: To become the next generation of bright, sparkling “school idols”! As long as we don’t give up, any dream can come true... All we have to do now is keep pushing hard for glory! Now their “School Idol Project” begins to make their dreams come true!

She is good at sewing and is in charge of making Aqours' stage costumes. She is a second-year student at Uranohoshi Girls’ High School. She is a member of the swimming club and is a national team level high dive swimmer. Her hobbies are muscle training and cosplay. She is a cheerful and active person who acts before thinking. However, she has a sensible side among the Aqours members. She is also a versatile person who is good at cooking and handing out flyers. She has known Aqours members Chika Takami and Kanan Matsuura since childhood. She was invited to join the school idol group Aqours by her childhood friend Chika. She is fond of saying "yosoro".

She is in charge of music production for Aqours. She is a second-year student at Uranohoshi Girls’ High School. She is a pianist who transferred from Otonokizaka Academy, the alma mater of the school idol group μ's. She has been expected to be a pianist since she was a child, but after a competition, she fell into a slump and transferred to Uranohoshi Girls’ High School to escape from music. She is quiet, calm, and shy but also a kind and gentle person who never forgets to be attentive to those around her. As soon as she transferred to the school, she was invited by Chika Takami to join the school idol group, and halfway through she was forced to join Aqours. She is not fond of dogs, and the "Shiitake" kept at Chika's house are her natural enemy. She also has a hidden otaku side, as she buys a lot of fanzines when she goes to Akihabara.

The founder of the school idol group Aqours. She is a sophomore at Uranohoshi Girls’ High School. She writes the lyrics for the songs sung by Aqours. Her family runs an inn, and she is the youngest of three sisters. She decided to form the school idol group Aqours in order to rebuild Uranohoshi Girls’ High School, which is in danger of being closed due to the declining birth rate. She looks up to Honoka Kosaka, who prevented the closure of Otonokizaka Academy through the formation of the school idol group μ's and their activities. She is friendly, cheerful, and attentive to others. She believes that she has no outstanding abilities or talents, and spends her days in agony, unable to have any dreams or hopes for the future.