From Sweden came the trend of Plogging, whereby joggers rid the streets of litter while running their routes. Japan has wandering litter cleaners too, but they're dressed in kimono and wield fire tongs like swords:
The group is called Jidaigumi Basara, and they describe themselves as a "Picking up trash Samurai Performance Team," doing their thing in order to draw people's attention to the litter problem. (The group seen in the video is the Tokyo branch; the parent group, Issei Ichidai Jidaigumi, is based in Hokkaido.)
What we want to see next: Footage of the sneaky ninjas responsible for depositing the trash, and hopefully a mass confrontation between the two groups.