When young Tomura listens to a piano tuner at work, the sound transports him back to the high, rustling forests of his childhood, and from that moment on, his life is shaped by a passion for music. He learns the craft of piano tuning, but despite his dedication, there is always the fear of failure in the pursuit of the perfect sound. When he is tasked with tuning the piano of the two sisters Kazune and Yuni, he realizes that it is about more than just technical skill – and that there is no single perfect sound. And when he hears Kazune, the aspiring concert pianist, play, he feels the calling of his life: to make her music shine. A novel full of poetry about the life-changing power of music and a young man who wants to bring the beauty of the world to life through it – beautifully and delicately told.