Yes, Liar Game – The Final Stage DVD & Bluray DVD have been released in Japan today.
Do feel free to order it online. ^^ http://www.amazon.co.jp/o/ASIN/B003TZMV7S/item03-22
This is a must-see item as a fan of Mr. Shota Matsuda.
If you live in Japan, you can also go to TSUTAYA to rent one.