From the nation that brought you AR on your desktop as a commercial product comes another step towards the glorious AR-enhanced future. The impressive thing? This appears to be an amateur application of the technologies, given the use of community favourite virtual idol Hatsune Miku (widely used in amateur music production for vocal elements).
Edit: Please alert me if you can't see the videos. Niconicodouga normally requires a signup, but I had heard that Sancon had an agreement to allow hotlinking.