Yosuga no Sora (ヨスガノソラ, lit. "Sky of Connection") is a Japanese romance/drama adult visual novel developed by CUFFS ("Sphere"). The game was originally released for Windows PC on December 5, 2008. It was adapted into a serialized manga and a TV anime series. A sequel/fan disk titled Haruka na Sora was released later on October 24, 2009 which contains new and expanded scenarios for several characters from the original game.
Source: http://www.facebook.com/pages/Yosuga-no-Sora/157152897642161
