Ichijinsha is a Japanese publishing company focused on manga-related publication, including magazines and books. The company was first established in August 1992 as a limited company under the name Studio DNA whose main purpose was to edit shonen manga. In January 1998, Studio DNA became a public company and moved from merely editing to now being a publishing company. In December 2001, a publishing company was formed named Issaisha which started the shojo manga magazine Monthly Comic Zero Sum. In March 2005, Studio DNA and Issaisha merged into the current Ichijinsha company.