The DVD is also no.1 in the overall DVD chart (which includes music-DVD, movie DVD, anime DVD, etc).
I'm still looking for official numbers though...
EDIT: Thanks meoinkie2 for THIS!
The DVD has sold 227,000 in the first week! That's another personal best (after Musekinin Hero for single and Puzzle for album), outselling 47 by 19,000! This is also the second highest first week sales in 2009 after Arashi's AAA in TOKYO (with 230,000).