Kasumi Toyama was enthralled by the stars as a young girl, so when she discovers a trail of star-shaped signs one day after transferring to a new school, she can't help but follow them. They lead her to a shop run by the grandmother of one of her new classmates, and Kasumi finds something that will change her life forever: a star-shaped guitar! And just like that, Kasumi knows that forming a band is her destiny. Of course, convincing Arisa and her grandmother to sell her the guitar won't be easy, and finding a group of other girls who want to become musicians will be even harder. But when a girl has stars in her eyes and a starbeat in her heart, there's nothing that will stop Kasumi from making her fantasies come true in BANG DREAM!