Koei Co., Ltd.

Koei Co., Ltd. was a Japanese video game developer and publisher founded in 1978. The company is known for its historical simulation games based on the novel Romance of the Three Kingdoms, as well as simulation games based on pseudo-historical events. Koei found mainstream success in its series of loosely historical action games such as Dynasty Warriors and Samurai Warriors, also known as the Musō series. It also owned a division known as Ruby Party, which focuses on otome games. On April 1, 2009, Koei merged with Tecmo to create the Tecmo Koei Holdings holding company. After operating as subsidiaries of Tecmo Koei Holdings for exactly a year, Koei and Tecmo were combined as a single company on April 1, 2010 to form Tecmo Koei Games (with Koei as the actual surviving corporation).