Shinkyoku Sōkai Polyphonica, also known as simply Polyphonica, is an all-age Japanese visual novel created by Ocelot and first released on the PC on April 28, 2006. Aside from the game, multiple series of light novels have been created, and a manga adaptation started in March 2007. An anime adaptation started airing in Japan on April 3, 2007. Another anime adaption aired from April to June 2009, and was a prequel of the events in the first anime.
The original game, the Crimson series, will start its second installment, covering the third and fourth story. The Black and White Polyphonica series were adapted from a printed novel to visual novel media in spring 2007, respectively titled Shinkyoku Sōkai Polyphonica THE BLACK and Shinkyoku Sōkai Polyphonica Memories White.