In my case I just wanted school to end so I could get away from the people who bullied me (wasn't quite lucky since I still ended up in the same class as some of them in college - but they weren't so bad without the main instigator)
Like Rain, high school was pretty terrible for me too. Worst part of my life.. When I got out I didn't fell any pressure from the society, but instead I felt like all the possibility of the word were in my hand, that I could do whatever and be whoever. I still remember that beautiful sensation of being free, right when I step outside for the last time.
Bit I do understand Keichii sadness, I think that he's the one thinking about future the most..he knows he will miss those times
That said, Japan is really different from my country..you have to decide first, then take a test..and many jobs consider only people from certain colleges, so... The pressure is big
When reality hits you so damn hard that you will never be in high school forever, even though it is the most wondeful part of your life. that someday at one point of your life you need to grow up. to become an adult. urgh.