Is a visual novel, but with real actor instead of drawn characters.
By the critics, it's seems to be a great game, even Famitsu gave the game a perfect score, but I can't judge by myself because I don't have a Wii -I don't even have a tv-.
I bought it because of this:
The game contains a bonus scenario written by Nasu Kinoko and drawn by Takeuchi Takashi of TYPE-MOON. That shows how much of a hardcore fan I am.
An anime is planned for 2009. Here are a few screenshots from the trailer of the extra DVD:
EDIT: I uploaded the trailer in YouTube