Four chapters that were published from 1991 to 1996 and not released in "tankōbon" format in previous releases were later collected into a single volume titled "Ghost in the Shell 1.5: Human-Error Processor". The manga was published on July 23, 2003, by Kodansha. It contained a booklet and a CD-ROM featuring the full stories, adding music to the manga scenes, and a screen saver. Dark Horse Comics announced an English version at the 2005 San Diego Comic-Con. The series was released as eight individual comic issues from November 1, 2006, to June 6, 2007, and was the first of the "Ghost in the Shell" manga released in the United States to read right-to-left. The four original titles were each split into two each, to make up the 8 in this series. It was later collected in a single volume in trade paperback format on October 10, 2007. The manga was later republished by Kodansha Comics on September 25, 2012.