They're not alone in promoting clean spectating: Senegalese fans have also been spotted indulging their tidying-up tendencies during this year's competition; the two teams face each other on Sunday, virtually ensuring a spick-and-span stadium afterward.
A number of clips capturing the post-match clean-up, after the majority of fans had left the stadium, were posted and shared on social media, earning the Japanese supporters widespread praise and high fives from the few remaining Colombia supporters, sporting the nation's striking yellow colours.
Netizens were awed by the gesture of discipline.
Fans of the Japanese team, nicknamed "Blue Samurai", whipped out large trash bags they had brought along, scouring the stands for litter at Saransk following the game.
Fans from Japan went on a similar cleaning spree during 2014's World Cup. The lessons in life we can take from the game. Japan won 2-1 against Colombia and Senegal won 2-1 against Poland, but that is not all.
Day six of the World Cup threw up plenty of highlights.
"You often hear people say that football is a reflection of culture". The supporters of Japan came with bin bags and cleaned up their part of the stadium.
It was a case of squeaky bum time when fans finally tore themselves away from the television earlier this week after a nail-biting first 45 minutes, with water use jumping 24 per cent in Tokyo during the break, the city's waterworks bureau said today.