The fourth generation of the Legacy Touring Wagon, Subaru's key commodities. Subaru focused on the development of the fourth generation Legacy with the goal of improving collision safety. Accordingly, the body design was completely redesigned, the body size was enlarged, and the body rigidity was dramatically improved compared to the previous generation. While the body size was enlarged, the new Legacy was lighter than its predecessor, thanks to greater design freedom and a fundamental review of the body structure. The fourth generation Legacy is characterized by its long model life. The Legacy had been changed every 4-5 years, but the 4th generation Legacy's high degree of perfection and popularity made it the longest model cycle of all Legacy models, with a 6-year cycle.

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 first-year student at Otonokizaka Academy. She is mild-mannered and kind, but at the same time, she is reluctant to do anything. In order to fulfill her childhood wish to become an idol, she voluntarily joined the school idol group "μ's". She has more knowledge and passion for idols than anyone else. She spends her days and nights collecting and analyzing information about school idols. She also loves to eat rice and is quite a glutton. She is a childhood friend of Rin Hoshizora, a member of μ's.