DOHA, Qatar -- For a second consecutive FIFA World Cup, Japan's fans have grabbed the headlines and captured hearts with their habit of cleaning up stadiums after matches.
While largely intriguing to the outside world, this is far from uncommon in Japanese society.
They are an orderly and respectful people. They aim to leave a place which they occupy in the same state they found it in when they arrived.
Even the Samurai Blue are famous for leaving their dressing rooms in a spotless condition. Perhaps even cleaner than when it received them.
That is not to say that the Japanese footballers are not making a mess in Qatar.
Fortunately, for the cleaners at Khalifa International Stadium on Wednesday -- and their upcoming venues on Sunday and next Thursday -- the only thing Japan are looking to leave in disarray is the established order at the World Cup.
They started doing that in their Group E opener against Germany, coming from behind to claim a first-ever win over the four-time world champions with two goals in the final 15 minutes.
The fact that his came 24 hours after Saudi Arabia beat Argentina by the same 2-1 scoreline was a massive statement by Asian football.
After all, prior the this year's tournament, the continent's representatives had combined for just 17 wins from 108 games at the World Cup dating back to 1938.
Already in the first week of Qatar 2022, three victories have been recorded.
And for Japan, in particular, they now stand a real chance of advancing into the knockout round and keeping alive their hopes of reaching the quarterfinals for the first time ever.
To be one of the last eight teams at a World Cup would indeed be upsetting the established order, with the competition usually dominated by the European and South American nations.
The Samurai Blue have a chance to seal their place in the Round of 16 with a game to spare on Sunday, should they beat Costa Rica and Germany fail to win against Spain.
Both are distinct possibilities, with the former even more so especially after Costa Rica were overrun by Spain in their opener as they fell to an emphatic 7-0 loss.
Japan will however have to prevent complacency from creeping in, lest they fall to a similar upset to the one they inflicted on the Germans.
And coach Hajime Moriyasu is aware they can ill afford to underestimate the Costa Ricans, saying: "The Costa Rica team have high physical performance and can play in an organised manner --that's what we have observed.
"They are a good team. For us, it will be a crucial second match."
Come 6 p.m. local time at Ahmad bin Ali Stadium in Al Rayyan on Sunday, there are things that will definitely happen, are likely to happen and could just happen.
The one scenario that is for certain is that the Japanese fans will once again be seen cleaning up after themselves and others and ensuring the arena is left in a near-spotless condition.
What is highly probably is that they will have just witnessed their Samurai Blue heroes see off Costa Rica to notch a second consecutive win at Qatar 2022.
And what could just happen, depending on what happens later on Sunday evening between Spain and Germany, is Japan taking another big step towards messing up the World Cup's established order -- and with a game to spare.