When Kagami Shouma stands on the school rooftop ready to end it all, an Italian melody pulls him back from the edge. The voice belongs to Minazuki Serena—the academy's delinquent half-Italian transfer student with fire-red hair and ice-blue eyes.

Shouma can't understand her songs, but the raw emotion transcends language. As his perfect class representative façade crumbles and her walls begin to crack, they forge an unlikely connection through music—the one language that bridges their cultural divide.

With the Cultural Festival approaching and the tyrannical student council president threatening to shut down their newly-formed Four Symbols Club, Shouma and Serena must overcome their past traumas to find their voice together—before the music, and their reason to live, disappears forever.