The Visual Novel is too slow-paced, the anime is unfortunately rushed...
It really suffers from being only 13 episodes. I believe it would have been done more justice if the anime was 26 episodes. I still like it, but the pace is ridiculous...
Besides, the skipping of Amane's route to the accident thing is not really too bad though... Not like there is happening anything in between besides some lust on Amane's part...