Nowadays, Kousei lives a quiet and unassuming life as a junior high school student alongside his friends Tsubaki Sawabe and Ryouta Watari. While struggling to get over his mother’s death, he continues to cling to music. His monochrome life turns upside down the day he encounters the eccentric violinist Kaori Miyazono, who thrusts him back into the spotlight as her accompanist. Through a little lie, these two young musicians grow closer together as Kaori tries to fill Kousei’s world with color.