Polyphonica

Shinkyoku Sōkai Polyphonica (神曲奏界ポリフォニカ), 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.

The anime adaptation started airing in Japan on April 3, 2007. A second season entitled Polyphonica Crimson S aired from April to June 2009, as a prequel of the first anime events.

Plot
In the continent of Polyphonica, spirits materialize in the world, surviving on the music that is played by humans, and live together with them. While the spirits do not appear often, some spirits have enough power to materialize in human or animal forms. Musicians called Dantists play Divine Songs using special instruments called One-Man Orchestra which enable the spirits they have partnered with to manifest their true powers. The Crimson series follows the adventures of a Dantist named Tatara Phoron and his contract spirit Coathicarte Apa Lagranges (Coatie). In the video game, the player plays Phoron as a student at "Torvas Divine Song Players Academy". In the anime series, he and his friends work together at "Office Tsuge Divine Song Players Management Group".