Kasumi Toyama,a high school student.she is looking for the "Star Beat", a sparkling and exciting sound which she heard while looking up at the night sky during her childhood days. One day, while returning from school, she comes across a pawn shop owned by one of her classmates. In the storage area, she finds a strange star-shaped guitar with glittery stickers on it. Then she find her four classmates that form a band called "Poppin' Party".