A Japanese game soft publisher based in Shibuya, Tokyo.
In April 2010, they merged with their parent company D3 and their sister ESP and formed "New D3". They belong to the Namco Bandai group.
D3Publisher was originally the software office of Culture Publishers (connected to Culture Convenience Club / TSUTAYA), but when the real estate company International Signal abandoned their real estate business, they reformed into D3Publisher, and made the software office independent.
They're mostly famous for the "SIMPLE" series (games in the price range of 1,500–2,960 yen) but are aso releasing full price games like Slot Games, Disney film games and games for girls.
Translated by user from source: Wikipedia, "ディースリー・パブリッシャー", available under the CC-BY-SA License.
D3 Publisher is a Japanese video game publisher founded in 1992.
The name stands for "Domain 3" and refers to the three publishing "domains" the company originally intended to enter--video games, music and books--although the company now exclusively publishes video games.
Source: Wikipedia, "Wikipedia D3 Publisher," available under the CC-BY-SA License.