Prototype Ltd. is a Japanese software company established on March 27, 2006 by Toshio Tabeta, a former producer of Interchannel. While still with Interchannel, Tabeta's team was responsible for mainly developing and publishing versions of visual novels originally published by Visual Art's for consumer platforms like the PlayStation 2 and PlayStation Portable. After Prototype split off from Interchannel, the company still continued to work with Visual Art's. Prototype is also involved in producing mobile phone ports through Visual Art's Motto which Prototype manages. Prototype has also produced a set of drama CDs based on Key's visual novel Clannad.

[From Wikipedia]