Working as an extra in movies and dramas for ten years, Kisa Shouta unconsciously had given up the notion that one day, he'd become the focus of the camera. In life, in career, even in his relationships, he's this unnoticed existence. Until one day, superstar Yukina Kou came into the scene. Kisa thought acting with the superstar behind camera would not hurt him. But he was wrong.

Takahashi Misaki works as a shadow singer for a Jpop icon who can't sing named Io(Shizuku Ishi). And when the great composer Usami Akihiko took a liking of the voice he heard in a performance, he took a liking of Io as well, not knowing that the voice he loved way back before was Misaki's.