Whether you consider them "true" video games or not, what are you favorite visual novels? Please only list those which you have played.

Back in the day, I completed quite a few which were published in America by Hirameki International. I wish I would have kept Ever 17 if only for the fact that these days it sells for about $200 while I sold it about a decade ago for only... $20.

What can I say?! I completed the stories and I was ready to part with it! How was I supposed to know its future price/rarity/demand would be like it is today?