Plot: Shinkyoku Sōkai Polyphonica, also known as simply Polyphonica, is an all-age Japanese visual novel created by Ocelot and first released for Windows on April 28, 2006. Aside from the game, multiple series of light novels have been created, and a manga adaptation started in March 2007. Wikipedia
Plot: Yoake Mae yori Ruriiro na, also known as Crescent Love, is a Japanese adult visual novel developed by August and first released on September 22, 2005 for Windows. It was later ported to the PlayStation 2 and PlayStation Portable. Wikipedia
Plot: Fortune Arterial is a Japanese adult visual novel, developed by August, released as a limited edition version on January 25, 2008 playable on Windows PCs as a DVD. Wikipedia