According to the official web site, Shibuya Tsutaya shop will give a present : a"original clear file" to Mirrorcle world ' s buyer , it's an limited present.
Ok, so....what it's a original clear file ?? " オリジナルクリアファイルをプレゼント"
http://avexnet.or.jp/ayu/jp/news/080404b.html