Arima Kousei is a former child prodigy who lost his ability to play the piano when his mother died. His daily life is monochrome, but it begins to gain colour when he meets a female violinist by chance.  Miyazono Kawori is an audacious go-getter who is overflowing with personality. Enchanted by the girl, Kousei starts to move forward with his own legs at the age of 14.