Doki Doki Literature Club
Higurashi no Naku Koro ni
Phoenix Wright
Fate/Stay Night
Difficult one, because on a different day I could potentially give an entirely different four. Also, I too struggled with the question of "is PW:AA eligible?" Considering people who I believe have more experience with the genre than I do think so, I'll go with it. If it's not eligible, add in a vote for Tokimeki Memorial.
Existence. Existence is but shallow question with no answer. Buu make you chicken nuggies!