I saw this in a recent article on Tokyograph (http://www.tokyograph.com/news/id-5367).
FujiTV is releasing a spin-off drama of its extremely popular drama (about to begin its 2nd season), "Liar Game" (ライアーゲーム), available via Fuji TV On Demand, which is an online pay-per-view / video-on-demand site. The spin-off is called "Liar Game Episode Zero" and is apparently about the two lead characters, set seven years before. Erika Toda's character is played by the young actress Mayuko Fukuda, who was in Death Note 3: L Change The World. Shoda Matsuda's character is played by Furukawa Yuta (4th generation Fuji Syuusuke).
See also Fuji TV's announcement with photographs (proving it really is TeniMyu's Furukawa Yuta):- http://wwwz.fujitv.co.jp/fujitv/news/pub_2009/091015liargame.html