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.
| Actor | Role |
|---|---|
 Sadao AbeSin | Sin |
 Riho YoshiokaFūka Ashitaba | Fūka Ashitaba |
 Yudai ChibaSakaguchi | Sakaguchi |
 Kumiko AsoFemale Doctor | Female Doctor |
 Eiji KotogeJimetsu | Jimetsu |
 Yuki KatayamaSeiko Inō | Seiko Inō |
 Yuko NakamuraKinomoto | Kinomoto |
 Shoko IkezuSin's Mother | Sin's Mother |
 Ryo IwamatsuMuryo Record Company CEO | Muryo Record Company CEO |
 Eri FuseDevil Woman | Devil Woman |
 Tetsushi TanakaCEO | CEO |
 Suzuki MatsuoUncle Zappa | Uncle Zappa |
 Yoshiyuki MorishitaHappy Soba Man / Pizza Delivery Man | Happy Soba Man / Pizza Delivery Man |
 Show KasamatsuPark | Park |