Kousei Arima was trained relentlessly by his mother from a young age to master the piano and meticulously follow the score, leading him to effortlessly win every competition and earn the nickname "Human Metronome." He was revered by his peers until his mother's death shattered him emotionally, rendering him tone-deaf and causing him to disappear from the stage for years. His life became monotonous as he relied on his childhood friends for support, but he couldn't abandon his love for music. When he met Kaori Miyazono, a violinist who played without constraints, everything changed. Their friendship sparkled with love, music, and a lie, as Kaori spurred him to rekindle his passion for music.