What? I'm not holding a tissue! That's insane! I would never cry.....

*Cries uncontrollably*

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Piano prodigy Kōsei Arima dominated various music competitions and has become famous among child musicians, but also controversial. After the death of his abusive mother, who was also his coldhearted instructor who forced him to play the piano emotionlessly, he had a mental breakdown at the age of eleven while performing at a piano recital which resulted in him no longer being able to hear the sound of his piano even though his hearing was perfectly fine.

Two years later, Kōsei hasn't touched the piano and views the world in monochrome, without any flair or color, resigning himself to living out his life with his good friends, Tsubaki and Watari, until, one day, a girl changes everything. Kaori Miyazono, an audacious, free-spirited, fourteen-year-old violinist whose playing style reflects her manic personality, helps Kōsei return to the music world and shows that it should be free and mold-breaking unlike the structured and rigid style Kōsei was used to, and as she continues to uplift him, he quickly realizes that he loves her, though she already likes Watari.

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The rest if for you to watch / read. No spoilers here!