Kure Software Koubou (呉ソフトウェア工房), or KSK, is a Japanese game development company founded in 1985 that creates games for many platforms, but focusing mostly on home computers. KSK's games are well known for the "Gochyakyara" (ゴチャキャラ "Multiple Character") system which KSK invented, which was a unique hybrid between the real-time strategy, action role-playing game and tactical role-playing game genres. Some of their games also used a European art style in addition to a Japanese anime style. KSK is also famous for having most of the cover art for their games created by renowned artist Yoshitaka Amano.
Source: Wikipedia, "Kure Software Koubou", available under the CC-BY-SA License.