Okay, I see it now. 1st april the sales were 200k, then it slowly builds up and at 31st it was 400K, in 2007. Then it stays 400K ish + before it 2 weeks later drop down to 200k.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS