Yukio (also called Koyuki) is somewhat of a loser. He's not very popular, athletic or musically talented. In fact his favorite musician is an idol singer.

His life seems to be on an upswing when he gets reacquainted with a childhood friend, Izumi and when he meets Ryusuke, a musician with connections to the very popular American band, Dying Breed.

Through Izumi and Ryusuke, Yukio becomes acquainted with the world of rock music and finds that he loves the Dying Breed. He then aspires to be a musician and begins to learn the guitar. His quick progress with the guitar and his incredible voice earn him a spot in Ryusuke's band, Beck.