After the Blue Samurai's achievement of being the first Asian team to beat a South American side in a World Cup match on June 19, fans celebrated by... staying back at the Saransk stadium in Russian Federation and tidying up after themselves.
Japan and Senegal meet in a Group H clash on Sunday and, judging from their behaviour earlier this week, the stadium could be left cleaner than it ever has been before.
Japan's somewhat surprising win over Colombian was followed by their fans carrying out cleaning duties with plastic bin bags they had brought into the stadium in similarly heart-warming scenes.
Here is a video of Senegal picking-up the litter.
Japan-based soccer journalist Scott McIntyre is following the team across Russian Federation, and told the BBC such cleanliness is to be expected from the fans.
"You often hear people say that football is a reflection of culture", he said. Fans from Japan went on a similar cleaning spree during 2014's World Cup. "An important aspect of Japanese society is making sure that everything is absolutely clean and that's the case in all sporting events", McIntyre explained.
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Japan soccer fans are pictured ahead of a match against Colombia in the Mordovia Arena in Saransk, Russia, on June 19, 2018.
One person tweeted that Cisse was "easily the most GIFable coach at this World Cup", while another said: "Aliou Cisse staring into your SOUL as he celebrates Senegal's win over Poland!"
Both sets of fans have been praised on social media for being considerate.
"Nigeria had one of the best African squads ever at the 1994 World Cup".
Not bad, Senegal and Japan.