That's from last year's Kohaku(Kohaku Uta Gassen), it's basically a yearly compiteition that takes place on New Year's Eve and has the most popular male and female artists in Japan split into two teams. The females are the red team and the males are the white team. The white team won that year. It's usually pretty highly rated, I think remember at one point its highest rating was an 80.3 or something close to that and it's lowest has only been a 30. I think this the first time something Kamen Rider related was used in a while.
It's still weird as heck seeing a battle fought to Shounen Yo!.