Ichijinsha

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Ichijinsha Inc.
Logo used since 2024
Headquarters in Shinjuku, Tokyo
Native name	株式会社一迅社
Romanized name	Kabushiki-gaisha Ichijinsha
Formerly	Studio DNA Co., Ltd. (1992-2001)
Type	Subsidiary (Kabushiki gaisha)
Industry	Books, magazines, manga
Founded	August 1992; 34 years ago (1992-08)
Founder	Osamu Harada
Headquarters	Shinjuku, Shinjuku, Tokyo , Japan
Key people	Masahiro Nouchi (president)
Revenue	¥10 million
Parent	Kodansha
Website	www.ichijinsha.co.jp

Ichijinsha Inc. (Japanese: 株式会社一迅社, Hepburn: Kabushiki-gaisha 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 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.

Magazines published

• Comic Rex
• Monthly Comic Zero Sum
• Comic Yuri Hime
• gateau (primarily for Boys' Love manga)