Louder!: Can't Hear What You're Singin', Wimp

Shing is a rock star with an amazingly loud voice that has a range of four octaves. His secret is that he has created his voice through some sort of vocal cord doping. His voice is now teetering on the edge, due to side effects from the vocal cord drugs. At this time, Shing meets Fuuka who is a street musician. When Fuuka sings, her voice is so low. Due to Fuuka, Shing ponders over his past.
(Source: MDL)