Koihime Musō: Doki Otome Darake no Sangokushi Engi is a series of Japanese adult visual novels and strategy video games primarily developed and published by BaseSon for the Windows and is based on the classic 14th century Chinese novel Romance of the Three Kingdoms by Luo Guanzhong. The first game was developed by BaseSon, and was first released on January 26, 2007, for Windows as two DVD-ROMs, followed by a re-release on April 11, 2008, containing an extra CD-ROM.