Tuner arrived at Higashikanade Academy to support the instrumental music club, captivated by a "magic sound" he heard at one of their concerts. What he found was a club in collapse—its members mentally absent, their motivation gone. On his first visit to the club room, a girl named Nanami Yuki plays the flute alone, beautifully, and then stops and leaves without explanation. A mysterious voice guides Tuner to the music preparation room, where a cat named Honya—the Spirit of Music—gives him the Nothung, a sacred instrument capable of breaking the curse that has driven the club members away. The adventure ahead is about reaching those girls before the music goes entirely silent.