Fall, when graduation is only half a year away. Haruki Kitahara, the final member of the light music club that dissolved, plays his guitar by the window after school in preparation for the school festival. It was the one and only adventure of a good student who spent two diligent years on his studies. But when a flowing piano melody and a voice as a clear as bell harmonize with his guitar… He goes from being alone, to being two, then three in the light music club, as the semester he dreamed of, no, hoped for, began.
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.
The wonder of magic lies in its ability to turn 1+1 into 3. Introducing Kishimori Rino, a third-year student with exceptional talent and aspirations of becoming a renowned singer. Her exceptional looks and skills make her a force to be reckoned with. Nakanome Kei, also a gifted student in the same grade as Rino, possesses an innate musical sense and has developed a unique style that sets him apart. Despite their allure towards each other, Rino and Kei are missing a crucial piece to their musical journeys. Thus begins the passionate pursuit of their shared dream as young musicians.