Tough choice...hmm...I think I would pick Kotonoha from School Days, why? well...
I was pissed at Makoto for being a jerk to her, she went through so much crap, and for what? A nice boat?! THAT WASNT WORTH IT!
I was traumatized and heartbroken after watching the entire anime, I HAD to check the game or else I would never have a good night of sleep, I knew that by being able to control that prick I could make the right choices and avoid a huuuuuuuge mess.
School Days HQ...I had to play it so I could attone for Makoto, I had to make him a nice guy, the one I knew he could be, I had to arrange that EVERYTHING would go well betwen him and Kotonoha, I wanted a happy ending betwen them, she deserved one... It was the least I could do...yet...In the end...I fell in love with her...