Ryuichi was the vocalist for the legendary band Nittle Grasper, along with Noriko Ukai and Tohma Seguchi. However, they disbanded three years ago and Ryuichi went to America to persue a solo career. There he met Mr K (Crawd Winchester) who became his manager. Later on, he returned to Japan where Nittle Grasper regrouped and caused rivalry for Shuichi's band, Bad Luck. Tatsuha Uesugi, is obsessed with him.

(Source: Wikipedia)

Most of the time Ryuichi looks and acts like a little boy but once he starts singing, he changes into a totally cool guy. He's bad at Japanese but good at english. He's nice to everyone. Even when Bad Luck and Nittle Grasper were up as rivals, he still treated Shuichi as a friend and helped him out a lot. He could be seen as a little naive but that's why he's so sweet.