From www.youtube.com - April 5, 2012 6:00 PM

It is called Ichiban Shibori Frozen Nama (一番搾りフローズン<生>) It appears that they use a machine to add frozen beer bubbles on top of normal Kirin Ichiban beer. The bubbles are very cold: -5 degrees Celsius. They claim that the frozen layer can keep the beer below it cold for about half an hour.