"Go! Go! Girl" is a manga series that centers on the life of Aoi Sakuraba, a high school student who unexpectedly becomes the manager of an all-girls pop group called "Go! Go! Girl." The group, initially struggling with internal conflicts and lack of direction, finds itself at a crossroads when their original manager abruptly quits. Aoi, who has no prior experience in the entertainment industry, steps in to fill the role, driven by her determination to help the group succeed.

The narrative explores the challenges Aoi faces as she navigates the complexities of managing a pop group, from handling interpersonal conflicts among the members to dealing with the pressures of the competitive music industry. The group consists of five distinct personalities: the confident and ambitious leader, Haruka; the shy but talented vocalist, Yui; the energetic and impulsive dancer, Rina; the pragmatic and level-headed guitarist, Miki; and the youngest member, the cheerful and optimistic keyboardist, Saki. Each member brings their own strengths and struggles to the group, creating a dynamic interplay of personalities and conflicts.

As the story progresses, Aoi works tirelessly to help the group improve their performances and gain recognition. The series delves into the personal lives of the members, revealing their individual motivations and backstories, which often influence their behavior and decisions within the group. Themes of friendship, perseverance, and self-discovery are prominent as the characters grow both individually and as a team. The group faces numerous obstacles, including rival bands, demanding producers, and the constant pressure to meet fan expectations.

The manga also highlights the behind-the-scenes aspects of the music industry, such as the rigorous training schedules, the importance of teamwork, and the impact of media and public perception. Aoi's journey as a manager is marked by her gradual development from an inexperienced outsider to a capable and respected leader who earns the trust and admiration of the group members. Through her efforts, "Go! Go! Girl" evolves from a struggling ensemble to a cohesive and successful pop group, achieving their dreams while overcoming the challenges that come their way.