An adventure story on the island of fairies told from the perspectives of two heroines. One night, the protagonist and her friend are suddenly called to a strange island in a dream. Kahoko Hino is called to the mysterious island “Harmony,” where a musical fairy named Fata lives, while Kanade Kohinata is called to a small, uninhabited island off its coast called “Cat Island.” Why were they called here? Will they be able to return to their own world? While searching for answers, the protagonists gradually become involved in the island's crisis and team up with musicians that arrived from another era in order to save the fairies. With new bonds and irreplaceable feelings developed, will they be able to save the fairies' island? Sure enough, that's the miracle of music—.