Fueled by an unshakeable passion to become an idol, Yuu Azuma, an ambitious first-year student at Joshu East High School, sets out to form an idol group. To realize her dream, she recruits one girl from each of the four high schools in her region—located to the north, east, south, and west—and soon gathers her fellow group members. Joining Yuu is Ranko Kashima, a refined second-year student at Holy Teneritas Southern Girls' Academy, notable for her distinctive curly hair and admiration for Madame Butterfly; Kurumi Taiga, a student at West Tech Vocational High School, who wears cute, oversized jackets with long sleeves and dreams of winning a robotics competition championship; and Mika Kamei, a student from Joshu North High School, known for her kind heart and dedication to volunteering. With the assistance of Shinji Kudou, Yuu's "collaborator" and confidante, these four young girls embark on the path to stardom. However, the journey conceals unexpected trials, rigorous demands, setbacks, and pressures that threaten to undo everything Yuu has worked so hard to achieve.