Songs, sumo and toilet trauma: Rugby fans descend on Japan bbc.com

It's the first time the oval-balled extravaganza has been held in Asia, and with the opening match scheduled for 20 September, visitors are already enchanted with the hosts' singing, beer traditions and… well, toilets.

Tournament organisers are terrified that the beer-loving rugby fraternity will catch Japan unawares and drink the stadiums dry – and with good reason.

At the 2015 World Cup in England, fan zones and match venues sold 1.9 million litres of beer. Venues that also host football matches said the rugby crowd drank six times more, on average.