"BanG Dream!" is a multimedia franchise that includes an anime series centered around the lives of high school girls who form bands and pursue their passion for music. The story primarily revolves around Kasumi Toyama, a cheerful and energetic first-year high school student who becomes inspired to start a band after encountering a star-shaped guitar in a pawnshop. Her fascination with the instrument leads her to seek out like-minded individuals to form a band, which she names Poppin'Party.

Kasumi's journey begins with her recruiting her childhood friend, Tae Hanazono, a skilled but aloof guitarist, and Rimi Ushigome, a shy bassist who is initially hesitant to join. The group expands with the addition of Sāya Yamabuki, the dependable drummer and Kasumi's classmate, and Arisa Ichigaya, the keyboardist who initially resists joining but eventually becomes a key member due to her organizational skills. Together, they navigate the challenges of balancing school life, personal struggles, and their musical aspirations.

The narrative explores the growth of Poppin'Party as they perform at local venues, participate in competitions, and gradually gain recognition. Their journey is marked by moments of self-doubt, camaraderie, and the joy of creating music together. The series also introduces other bands, such as Roselia, Afterglow, Pastel＊Palettes, and Hello, Happy World!, each with distinct musical styles and personalities. These bands interact with Poppin'Party, creating a vibrant community of musicians who support and challenge one another.

As the story progresses, the characters face various obstacles, including creative differences, stage fright, and the pressures of performing. Kasumi's unwavering optimism and determination often serve as the driving force for the group, inspiring them to overcome setbacks and stay true to their passion. The series emphasizes themes of friendship, perseverance, and the transformative power of music, showcasing how the characters grow both individually and as a collective.

The anime blends slice-of-life elements with musical performances, offering a mix of heartfelt moments and energetic concerts. The characters' interactions and personal arcs are interwoven with their musical journey, creating a narrative that is both engaging and emotionally resonant. Through its focus on the challenges and triumphs of young musicians, "BanG Dream!" presents a compelling portrayal of the pursuit of dreams and the bonds formed through shared creativity.