Kousei Arima bachpan se hi piano bajanay mein itna perfect tha ke log usay “Human Metronome” kehte thay. Apni sakht maa ki wajah se wo har competition jeet jata tha aur log uske deewane thay. Par jab uski maa ka achanak intiqal ho gaya, toh us sadmay se usay piano ki awaaz sunna hi band ho gayi, aur usne hamesha ke liye stage chor diya.
Ab Kousei ekdum chup-chap aur aam si zindagi guzar raha hai apne doston, Tsubaki aur Watari ke saath. Wo apni maa ke gham se nikal nahi paa raha, par phir bhi music ko dil se nahi nikaal saka. Uski is be-raunak zindagi mein tufaan tab aata hai jab wo ek ajeeb aur mast-mola violinist, Kaori Miyazono se milta hai. Kaori ek chhotay se jhoot ke sahare usay zabardasti wapas stage par khinch laati hai aur uski feeki duniya ko apnay rangon se bhar deti hai.
