|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. In October 2016, Ichijinsha was acquired by Kodansha and became its wholly owned subsidiary.
- 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.
- "Kodansha Acquires Ichijinsha, Makes It Into Subsidiary Company". Anime News Network.
- Official website (Japanese)
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