Mazda's mainstay, succeeding the status of the Familia to date. The car's name outside Japan is MAZDA3. The first generation Axela (BK series) was introduced in 2003 and entered the C-segment, which was crowded with strong rivals such as the Volkswagen Golf, It was highly acclaimed in Europe, where the competition was fierce, for its excellent maneuverability and other features. This is the second generation of the model, which was introduced in 2009. Like the first generation, it is characterized by its excellent maneuverability, The "Emergency Signal System," which warns the driver of a potential collision, and the "Rear View Signal System," which detects vehicles approaching from behind, are also available. And the "Rear Vehicle Monitoring System, " which detects and warns of vehicles approaching from behind. Mazda's unique safety technologies are actively introduced in this model.

Spring of the first year of high school. Kumiko Omae, who was in the brass band in junior high school, goes to visit the brass band with her classmates Hazuki Kato and Sapphire Kawashima, She goes to visit the brass band with her classmates Hazuki Kato and Sapphire Kawashima. There, Kumiko sees her former classmate, Reina Kousaka. Hazuki and Sapphire seem to have decided to join the brass band, but Kumiko is not ready to take the plunge. What she recalls is what happened with Reina at a brass band competition in junior high school. Through their activities in the brass band, they discover something irreplaceable. This is a coming-of-age story of girls who are seriously competing with each other.

She enrolls in Kita-Uji High School because of her admiration for sailor suits. Although she has no particular preference, she will be playing the euphonium in the brass band at her high school. She is easily influenced. She has a habit of saying out loud what she thinks. She is very concerned about a comment she made to Reina at a junior high school competition.