"Futsū no Joshikōsei ga Locodol Yattemita" centers around Nanako Ukishima, an ordinary high school girl who is unexpectedly recruited to become a local idol, or "locodol," for her small town of Nagarekawa. The series explores her journey as she balances her daily school life with her new responsibilities as a representative of her community. Alongside Nanako is her classmate Yui Mitarai, who is also chosen to be a locodol. Together, they form the idol unit "Nagarekawa Girls," tasked with promoting local businesses, events, and tourism through performances and public appearances.

The narrative delves into the challenges and rewards of being a locodol, emphasizing the grassroots nature of their work compared to the glamorous world of mainstream idols. Nanako initially struggles with self-doubt and the pressure of performing in front of others, but she gradually grows more confident with the support of Yui and their manager, Mr. Tokiwa. Yui, on the other hand, is more outgoing and enthusiastic, often encouraging Nanako to step out of her comfort zone. The duo’s dynamic evolves as they navigate their roles, learning to collaborate and connect with their community.

As the series progresses, additional characters are introduced, including other locodols and town residents, each contributing to the development of the story. The focus remains on the everyday efforts of Nanako and Yui, highlighting their small-scale but meaningful contributions to Nagarekawa. The series portrays the locodol experience as a blend of hard work, camaraderie, and community spirit, offering a grounded and relatable take on the idol genre. Through its episodic structure, the show captures both the humorous and heartfelt moments of their journey, providing a lighthearted yet sincere depiction of life as a local idol.