Monthly Shōnen Magazine
The original manga was written and illustrated by Harold Sakuishi and published by Kodansha in its "Monthly Shōnen Magazine" from 1999 to its May 2008 issue (which was released on April 5). A special 77-page side-story was published in the October 2008 issue of "Monthly Shōnen Magazine". It depicts the last day of Eddie Lee, a popular American rock musician and Ryusuke's friend. The 103 chapters (including the Eddie Lee special) were combined into 34 "tankōbon" volumes.