Rewrite (オープニングアニメ) is Key’s newest visual novel, scheduled for release on 24 June this year. For those who don’t know (you should be ashamed!), Key is famous for its visual novels, Air, Kanon, Clannad, Tomoyo After, etc. One recently finished anime, Angel Beats!, was produced by Jun Maeda who has worked on the major Key works previously mentioned.
The opening anime movie has just been released on youtube about a week ago, so yeah sorry for the delay. I really hope that this visual novel will get adapted into an anime!