Thanks all of you for the recommendations, Recently I downloaded Grisaia no Kajitsu, has good graphics and a professional quality translation , but is not that I'm looking for.
For the key's VN, I've seen all of the anime adaptations (Clannad (my personal favorite), Kannon, Air and Little busters).
Now I'm dowloading Cross Channel, Rewrite, Hoshizora no Memoria (The plot is very like kono oosora ), Hourglass of Summer
What do you think about Cross Channel and Hourglass of Summer?