Koihime Musō: Doki Otome Darake no Sangokushi Engi (恋姫†無双 ～ドキッ☆乙女だらけの三国志演義～ lit. Love Princess†Unmatched ~Throb☆Romance of Three Kingdoms Filled with Girls~) is a series of Japanese adult visual novels and strategy video games based on the classic Chinese novel Romance of the Three Kingdoms. The first game was developed by BaseSon, and was first released on January 26, 2007, for the PC as two DVD-ROMs, followed by a re-release on April 11, 2008, containing an extra CD-ROM. The gameplay in Koihime Musō follows a linear plot line, which offers pre-determined scenarios and courses of interaction, and focuses on the appeal of the female main characters. A PlayStation 2 version, titled Koihime Musō (恋姫†夢想) developed by Yeti and published by Regista was released on October 30, 2008. A new version of Koihime with many new characters Shin Koihime Musō: Otome Ryōran Sangokushi Engi (真・恋姫†無双 〜乙女繚乱☆三国志演義〜) was released on December 26, 2008. A third version of Koihime Shin Koihime Musō: Moe Shōden (真・恋姫†無双～萌将伝～) was released on July 23, 2010. European game publisher MangaGamer acquired licensing rights to the first game and released it on February 28, 2011. June 2012 the website Jlist.com began selling copies of Koihime Musou as a DX version with restored voices; in a partnership with MangaGamer. Another game named Koihime Eiyūtan has been announced; however, it is unknown if it is a follow-up or a remake of a preceding game.
A 2D fighting game titled Koihime Enbu (恋姫†演武) has been announced for a January 28, 2016 release on the PlayStation 3 and PlayStation 4.
Koihime Musō: Doki Otome Darake no Sangokushi Engi has made several transitions to other media. A manga adaptation by Japanese illustrator Yayoi Hizuki was first serialized in the Japanese magazine Dengeki G's Festival! Comic on April 26, 2008. An anime adaptation produced by Dogakobo began broadcasting on July 8, 2008, and several seasons have continued.