The video games provide the canonical story of the series. The manga series is adapted by Shiro Amano and the novels are written by Tomoco Kanemaki and illustrated by Shiro Amano. The stories follow the events that take place in the video games with differences to account for the loss of interactivity that a video game provides. The manga and novel series are both divided up into three series based on each of the three main video games. Each series is further broken up into multiple volumes. The manga was originally serialized in Japan by Square's Monthly Shonen Gangan, but has since been released worldwide. The manga was released in the United States by Tokyopop near the end of 2005, but was discontinued in 2008.