The third generation of the Atenza (known as Mazda6 outside Japan), which went on sale in 2012. Mazda's new SKYACTIV TECHNOLOGY, which aims to significantly improve vehicle performance, and a new design theme, "KODO - Soul of Motion," have been fully applied to the Atenza. The new model is the second model to be developed under the new design theme of "KODO - Soul of Motion". The wheelbase differs between the sedan and wagon, The wheelbase of the sedan is 2830 mm, while that of the wagon is 2750 mm. This is due to the marketing result that sedan users place more importance on the rear passenger space than wagon users. The third-generation Atenza was also the first passenger car in the world to use a capacitor as a storage battery, and it was a model in which Mazda's environmental, energy-saving, and safety technologies were lavishly applied. As a result, the Atenza is highly competitive in the D-segment, where strong rivals such as the BMW 3 Series and Mercedes-Benz C-Class are crowded.

The story is set in Tokyo, where an old school right in between the neighborhoods of Akihabara, Kanda and Jinbocho is in danger of consolidation and closure. Nine girls, centering Honoka Kosaka, have stepped up to defy the imminent danger facing their school. “If we want to protect our beloved school, we need to do what we can? we need to become idols!” Hoping against hope there’s something they can do about this, the girls strive to become famous, spread the word about their school, attract more students, and save the day. Now their “School Idol Project” begins to make their dreams come true! “Make our dreams come true!”

A third-year student at Otonokizaka Academy. She is the student body president of Otonokizaka Academy and a dance coach for μ's. She was raised in Russia, the home of ballet, where she received a gifted education in ballet from an early age, and although she had great hopes for her future as a ballerina, she failed in her career. Her dancing ability is at a professional level. At first, Eri was skeptical of Honoka Kousaka's plan to increase the number of applicants to Otonokizaka Gakuin and prevent the consolidation of Otonokizaka Gakuin through publicity for the school idol program, but Honoka's enthusiasm inspired her to join μ's herself. Her grandmother is Russian, and she is fluent in Russian. Her habit is to say "Harasho" in Russian.