When an out of tune singer-songwriter writes duets with a stranger with a voice of a lullaby in a local karaoke bar, days later, she discovers that the man with the soulful voice is Ren Ichijō , Japan’s top idol.

Despite their different worlds apart, Airi begin meeting in secret with Ren to write duets that belong to neither of their worlds. Through music, Airi learns to stop hiding her voice, and Ren rediscovers how to sing from his heart.

But when the spotlight inevitably finds them, they’ll have to decide: is their connection strong enough to survive the noise of the world that refuses to let them simply sing together?