Piano prodigy, Kousei Arima dominates the competition and has become well known. After his mother, who is also his instructor, dies, he has a mental breakdown, while performing at a piano concours when he is eleven years old. As a result he is no longer able to hear the sound of his piano even though his hearing is perfectly fine. Two years later, Kousei hasn't touched the piano and views the world in monotone, without any flair or color. He has resigned himself to living out his life with his good friends, Tsubaki and Watari, until, one day, a girl changes everything. Kaori Miyazono, a pretty, free-spirited violinist whose playing style reflects her personality, helps Kousei return to the music world and shows that it should be free and mold breaking unlike the structured and rigid style Kousei was used to.