Ever since her father squandered the last of the family fortune and fled town, Kanae Otowa has resided in her family's ancestral mansion, Otowakan. With no means to repay her father's debts, Otowakan faces foreclosure, forcing Kanae to evict the remaining inhabitants: her friend Sousuke Kagura, and two peculiar individuals claiming to be her father's acquaintances, Wolfgang Amadeus Mozart and Ludwig van Beethoven. After being resurrected under mysterious circumstances, Mozart and Beethoven have adopted the aliases "Motes" and "Beethes," respectively, and have taken up various foolish, non-musical hobbies. While stubbornly refusing to vacate Otowakan, Beethes unlocks the hidden power of Musik, saving the mansion from demolition and postponing his eviction. This discovery attracts other Musik users to Otowakan, including Frédéric Chopin, Franz Liszt, and Franz Schubert. However, not all Musik users harbor innocent intentions. Across the city, the enigmatic Johann Sebastian Bach perches atop a tall building, plotting how to exploit his Musik.