Kanae, a normal high school girl, is reunited with her least favorite house guests. There's Beet-san (otherwise known as Ludwig van Beethoven) and free-spirited Motz (Wolfgang Amadeus Mozart), as well as fellow squatters Chopin, Liszt, and Schubert. These maestros have already proven they have the skill to save the world with their explosive melodies called "Musik," but with…