Imagine Breaker wrote...
Fate/stay night, G Senjou no Maou, Sharin no Kuni Himawari no Shoujo, and Tsukihime come to mind right away. Tsukihime is a bit old, but quite good.
I wasn't too into the Fate/Stay Night anime (only watched first episode though), so I'll go ahead and skip to the second one listed, G Senjou No Maou. Thanks Ark for your recommendation and your work at Yandere. I'll go ahead and tell you how I like the game/s after I play them. :D
Edit: Oh, the name of the last recommendation sounds epic. I might have to try that one instead.