|Industry||Books, Magazines, Manga|
|Headquarters||Shinjuku, Tokyo, Japan|
|Osamu Harada (president)|
The company was first established in August 1992 as a limited company under the name Studio DNA whose 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 shōjo manga magazine Monthly Comic Zero Sum. In March 2005, Studio DNA and Issaisha merged into the current Ichijinsha company.
- Febri (formerly Chara☆Mel)
- Comic Rex
- Monthly Comic Zero Sum
- Comic Yuri Hime
- Manga 4-koma Palette
- Comic Yuri Hime S
- "Ichijinsha company information at the company's official website" (in Japanese). Ichijinsha. Retrieved 2008-01-27.
- Official website (Japanese)
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