Living in her family's ancestral mansion, Otowakan, Kanae Otowa faces foreclosure after her father vanishes, leaving behind debts. To save her home, Kanae must evict its remaining occupants—her friend Sousuke Kagura, and two eccentric individuals claiming to be her father's associates, Wolfgang Amadeus Mozart and Ludwig van Beethoven. The resurrected Mozart and Beethoven, now known as Motes and Beethes, immerse themselves in nonsensical activities. Beethes, adamant about staying at Otowakan, unveils the latent power of Musik, thwarting the mansion's demolition and staving off his expulsion. As word of this power spreads, other Musik users like Frédéric Chopin, Franz Liszt, and Franz Schubert flock to Otowakan. However, not all who wield Musik harbor pure intentions. Meanwhile, the mysterious Johann Sebastian Bach strategizes atop a towering edifice, contemplating the manipulative potential of his own musical prowess.