WATCH: Japanese rugby lovers sing SA national anthem

Cape Town - Rugby World Cup fever has hit Japan in a big way. 

That much is clear in a video that is currently gaining traction on social media in which a group of Japanese supporters sing the South African national anthem. 

The video was shot at the Kumagaya Stadium and it was reported that around 400 locals - including the town's mayor - turned up to form the choir. 

The stadium will host the September 6 warm-up clash between the tournament hosts Japan and the Springboks in what will be South Africa's final hit-out before their September 21 tournament opener against the All Blacks in Yokohama. 

The Kumagaya Stadium will host three World Cup fixtures: Russia v Samoa (September 24), Georgia v Uruguay (September 29) and Argentina v USA (October 9). 

The fans, clearly, are prepared.