Ichijinsha(株式会社一迅社,Kabushiki kaisha Ichijinsha?) is a Japanesepublishing 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 which main purpose was to edit shōnen 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 shōjomanga magazineMonthly Comic Zero Sum. In March 2005, Studio DNA and Issaisha merged into the current Ichijinsha company.