I finished one route in this game and I have to say it was a great experience. Definitely recommend this game. It focuses more on characters and their interaction and isn't just about sex like most VNs these days.
The cracks work but only in conjunction with a "kdays.dll" that you have to copy to windows/SYSwow64. I'm surprised nobody has mentioned this thus far. I found the dll in a rewrite thread.
link: http://depositfiles.com/files/urr93uzef