Little Busters! OP, the Key/Visualart´s work

Key's newest (all-ages) game (with a release date set in late July) and
script by Maeda Jun's
Fully voice, complete with a cast ranging from Midorikawa Hikaru
themes like youth and friendship.

http://key.visualarts.gr.jp/newsoft/

Demo is out...almost 200mb
but lasted less then 10 min...
OP is 133mb
Battle is like Fate: Stay Night