Koihime Musou is a fantasy eroge developed by BaseSon. Following the game's original release in 2007, a TV anime adaptation produced by Marvelous Entertainment aired during 2008, and at the end of that year an expanded version of the game - called Shin Koihime Musou - was released. As the franchise moved on, 2009 brought a Koihime Musou OVA (from April) and also a second TV anime series Shin Koihime Musou. In 2010, three more anime titles followed: the single-episode OVA Shin Koihime Musou: Live Revolution, the TV anime series Shin Koihime Musou: Otome Tairan, and yet another Shin Koihime Musou OVA.