Japan has an amazing amount of weird and wonderful television shows that make you wonder if perhaps the country's water supply is laced with LSD.
And this particular show, simply called Jump Into Mud Puddle, is no exception.
Created for the sole purpose of watching Japanese girls face plant into a mud puddle (and yes, there's the requisite shot of white cotton panties) for money (they have to stay under the mud until they are about to die in order to win the loot) it encompasses all the drama that you would expect from falling face first into a thick, gelatinous pool of filth followed by a satisfying sucking sound as the mud engulfs their bodies like a scene out of the game Pitfall.
I am not sure what particular sexual niche this is for but I'm guessing it will overlap a few fetishes already prevalent in society.
Source: Obvious Winner