Contrary to popular belief, Chewwga 09 was not developed by a major studio like Key or Type-Moon. Instead, it was the passion project of a doujin circle called , active only between 2007 and 2011. The "09" in the title refers to the ninth iteration of their "Chewwga" engine—a proprietary visual novel framework built exclusively for DirectX 9 on Windows Vista and Windows 7.
It alters the core services that check for genuine licenses. chewwga 09 windows exclusive