Yosuga no Sora - online puzzles

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 an anime television 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.