Doujinshi circle.
Names: スタジオ砂時計 (Studio SUNADOKEI), studio砂時計 (studio SUNADOKEI), B:side
http://sirpent.sakura.ne.jp
http://www.dlsite.com/maniax/circle/profile/=/maker_id/RG04160.html
http://www.dlsite.com/maniax/circle/profile/=/maker_id/RG09929.html
http://doujinshi.mugimugi.org/browse/circle/2328/Studio-SUNADOKEI/
http://sirpent.hp.infoseek.co.jp
