Hazardlife said:
Fate/Stay Night.
Because Unlimited Blade Works is awesome, and you get to shag Saber.
They said video game, not carefully disguised Japanese wall of text.
But should, as a pure and undiluted hypothetical matter, I be able to live in a visual novel of my choosing.........you know, if forced to choose one out of my extremely small library of titles....... I'd cheat my way into the "Shakugan no Shana" universe since it had a horrid PS2 VN remake at one point in it's splendorous commercialization career(AKA goreful source material rape).
If anyone's seen the anime then think of the original novels as the writing style employed in the translations of Gilgamesh meets an amount of plot devices, background characters and organizations rivaling the word count in the Webster's dictionary.