Erotic visual novels are legit though. I mean not the ones that are like the Space Pirate Sara variety where it's a terrible plot made as an excuse to get to the sexy stuff. But stuff like Devil on the G String or Kira Kira where it's like more novel than erotic is good. Once you get past the fact that visual novels tell their narratives in the most...sluggish manner possible. 

Everyone go read/play Saya no Uta.