The third generation of the Atenza (known as Mazda6 outside Japan), which went on sale in 2012. The Atenza is the second model to be developed that fully applies Mazda's new SKYACTIV TECHNOLOGY technology and new design theme, 'Kodo - Soul of Motion', which aims to significantly improve vehicle performance. The wheelbase differs between the sedan and wagon, with the sedan wheelbase at 2830 mm, while the wagon wheelbase is 2750 mm. This was done in consideration of marketing results, which showed that sedan users place more importance on rear seat 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 was a model in which all of Mazda's environmental, energy-saving and safety technologies were fully incorporated. As a result, the Atenza became a highly competitive car in the D-segment, where strong rivals such as the BMW 3 Series and Mercedes-Benz C-Class were in the market.

Otonokizaka Gakuin, a traditional school located between Akihabara, Kanda and Jimbocho, is on the verge of consolidation. Nine girls, led by second-year student Kosaka Honoka, rise up to meet the school's crisis. What we can do to protect our favourite school. ...... That is to become an idol! Become an idol to publicise the school to the world and increase enrolments! This is where the girls' 'story of making it happen together' School Idol Project began!

Third year at Otonokizaka Academy. She is the student council president at Otonokizaka Academy and a dance coach for μ's. She grew up in Russia, the home of ballet, and was educated as a gifted ballet dancer from an early age. Her dancing ability is at a professional level. At first Eri was sceptical about Honoka Kousaka's plan to increase the number of applicants to Otonokizaka Gakuin and prevent the consolidation of Otonokizaka Gakuin through the publicity effect of School Idol, but she was inspired by Honoka's enthusiasm and joined the group herself as a member of μ's. She was also inspired by Honoka's enthusiasm and decided to join as a member of μ's herself. Her grandmother is Russian and she is fluent in Russian. Her habit is to say "Harasho" in Russian.