The series revolves around Kasumi Toyama, a high school student who looking for the "Star Beat", a sparkling and exciting sound which she heard while looking up at the night sky during her childhood days. Ever since then, she is constantly searching for something that will stir her spirits up. One day, she finds a strange star-shaped guitar with glittery stickers on it. Without knowing, she immediately decides to form a band after witnessing the performance by a band at a live house.