"Love Live! Nijigasaki High School Idol Club Next Sky" centers on the Nijigasaki High School Idol Club, a group of students who come together to create and perform as school idols. The series explores their journey as they navigate personal growth, teamwork, and the challenges of balancing their dreams with everyday life. Each member of the club has unique motivations and aspirations, contributing to the group's dynamic and the diversity of their performances.

The narrative begins with the club preparing for their next big event, aiming to showcase their talents and connect with their audience on a deeper level. The story delves into the individual struggles of the members, such as overcoming self-doubt, finding their voice, and strengthening their bonds with one another. Key characters include Ayumu Uehara, a kind-hearted and determined girl who serves as the emotional core of the group; Setsuna Yuki, a passionate and energetic performer with a dual identity as a school idol and a regular student; and Kasumi Nakasu, a cheerful and confident member who often brings humor and energy to the group.

As the club works toward their goals, they face various obstacles, including rivalries, creative differences, and the pressure of living up to expectations. The series highlights their perseverance and the importance of collaboration, as they learn to support one another and grow both individually and as a team. Performances are a central element, with each episode often culminating in a musical number that reflects the characters' emotions and progress.

The story also explores the relationships between the members and their interactions with the school community, emphasizing themes of friendship, self-expression, and the pursuit of dreams. Through their journey, the Nijigasaki High School Idol Club strives to inspire others and leave a lasting impact, both on their audience and within their own lives. The series balances lighthearted moments with heartfelt drama, creating a narrative that resonates with fans of the idol genre while staying true to the core values of the "Love Live!" franchise.