Adult PC Game Yosuga no Sora To Be Animated

According to the cover note of the manga vol.1, Sphere's adult PC game "Yosuga no Sora" was announced to get an anime adaptation.

Yosuga no Sora game official website

Yosuga no Sora game was released in December 2008 and its manga adaptation has been serialized in Comp Ace magazine since last August.

Source: Scan of the note