After suffering through a long and unsuccessful series of fertility treatments, Satoko and her husband Kiyokazu make the decision to adopt a child. Six years after adopting a boy they named Asato, Satoko has quit her job to concentrate fully on her husband and son. The family lives a peaceful existence until the arrival of a stranger.
Sin is a rock star. He has an amazingly loud voice with a range of four octaves. His secret is that he has created his voice through a method of vocal cord doping. His voice is now teetering on the edge, due to side effects from the vocal cord doping. Around this time, Sin meets Fūka, who is a street musician. When Fūka sings, her voice is so small. Due to Fūka, Sin looks back upon his past.
Ryo (Yamada Masasi), the lead singer of an amateur rock band at night, owns a Ramen noodle shop. He cannot fly on airplanes because he has a fear of them. Ironically, he finds himself attracted to a stewardess who comes to eat very often at his shop. One day, an opportunity comes knocking on their doors - they are to perform in Seoul. The performance day approaches, but their dream of performing in Seoul is about to be shattered because of Ryo, who cannot fly on an airplane. As a last resort, Ryo decides to take a taxi in Tokyo and fly to Seoul, leaving behind the charming stewardess who makes his heart flutter.