Ordinary and inconspicuous high-school girl Yamada Rana suddenly has her life turned upside down when a classmate uploads a video of her without permission. Her voice in the video sounds almost exactly like that of superstar voice actress Kouke Sa Shion.
The video goes viral, and before long Shion's manager approaches Ranawith Shion herself appearing over a call. Then comes an unbelievable request:
Will you switch places with me?
Although Rana is bewildered by the idea of becoming a substitute voice actress, she is also thrilled that someone finally needs her voice. From there, the supposedly colorless and transparent girl begins entering the world of acting and voice performance.