"BanG Dream!" is a multimedia franchise that includes an anime series centered around the lives of several high school girls who form bands and pursue their passion for music. The narrative primarily revolves around Kasumi Toyama, a cheerful and energetic first-year high school student who becomes inspired to start a band after discovering a star-shaped guitar in her childhood. Her journey begins when she meets Sāya Yamabuki, a drummer, and they decide to form a band together. They are later joined by Rimi Ushigome, a shy bassist, Arisa Ichigaya, a reserved keyboardist, and Tae Hanazono, a skilled but eccentric guitarist. Together, they form the band Poppin'Party, which becomes the central focus of the story.

The series explores the challenges and triumphs of forming and maintaining a band, from writing original music to performing live. Kasumi's unwavering enthusiasm and determination drive the group forward, even as they face setbacks such as stage fright, creative differences, and the pressures of balancing school life with their musical ambitions. The narrative also delves into the personal growth of each character, highlighting their individual struggles and how they overcome them through their shared love of music.

As the story progresses, Poppin'Party interacts with other bands, such as Roselia, Afterglow, Pastel＊Palettes, and Hello, Happy World!, each with its own distinct style and personality. These interactions add depth to the narrative, showcasing the diverse approaches to music and the camaraderie among the bands. The series emphasizes themes of friendship, perseverance, and the transformative power of music, as the characters work together to achieve their dreams and connect with their audience.

The anime blends slice-of-life elements with musical performances, creating a balance between character-driven storytelling and dynamic concert scenes. The music, which includes both original songs and covers, plays a central role in the narrative, reflecting the emotions and aspirations of the characters. Through its focus on collaboration and self-expression, "BanG Dream!" presents a heartfelt portrayal of the challenges and joys of pursuing a creative passion.