Timid Lapis Lazuli was never ready for what a private high school had to offer, not including falling in love with her close friend. But, basic algebra is nothing compared to what destiny has in store for her. When a talking cat and lion tell Lapis that she has been chosen to save the world from an ancient evil, she must become a Muse Star. Now, she must gather a team of heroines and find nine magical instruments in order to protect the music of the world from being destroyed. Join Lapis and all the Muse Stars on all their exciting adventures of music and friendship.