Which isn’t the case for most ren’ai games – in fact, SHUFFLE! is the only games that comes to my mind with such a situation.
Methinks you didn’t play many ren’ai games, Nande-san~
My Japanese is still far too weak to attempt this feat. Unfortunately.
Yeah you need at least 15 minutes sometimes and the main protagonist has to do something for the girl like picking up her pencil on the ground, kicking a dog who barked at her, having been randomly selected to get married with her, making some random promise during your childhood (don’t forget to… forget it or else it won’t work), …
Just like real life 
(where are the 2D girls in my 3D world ?)
Did you try putting the disc in the drive? Most games won’t install unless the disc is in the drive.
[duck]
At least they could do it…
