It is 25 years after µ's disband, Yuna Kosaka, the daughter of Honoka Kosaka, starts her second year at Otonokizaka High with her two best friends, Akari Minami and Rio Sonoda. Following the steps of her mother, Yuna wants to start her own school idol club. However, a one thing stands in her way. Julia Lobov, third year and Student Council President. Read as history repeats itself.