The studio/ producer for this game is IDEA FACTORY / DESIGN FACTORY
The illustrator for Hisui no Shizuku Hiiro no Kakera 2 is Yone Kazuki. She is a wonderful artist and i think she deserve to be known and have a category listed.
It is loosely translated into English as Scarlet Fragment, is a japanese visual novel created by idea factory directed at the female market, known as an otome game. It is first released in 2006.
if you know other info regarding this game or it prequel / sequel, you are welcome to share.