The tale explores how two boys, despite their contrasting histories, discover tranquility by bonding over their mutual affection for the piano. Kai was raised by a sex worker and grew up tinkering with a long-forgotten piano concealed in the woods close to his home. Meanwhile, Syuhei descends from a line of renowned pianists and has practically grown up alongside the instrument. Regardless of their disparate backgrounds, the love they share for the piano unites them in a profound way.