It's reasonably popular over there, but not like it was a few years ago. Back when Pride was king and Sakuraba was beating the Gracies, you couldn't go anywhere without people knowing about MMA. Even now, the Japanese fans are probably more educated than the Western fans, as far as fighting techniques and the history of the fighters. The environment is a bit different, too, as the Japanese fans will be almost completely silent until there was a big strike or reversal. Then there'd be some oooh's and some applause. But at the height of the popularity of MMA in Japan, they were regularly seeing crowd attendance numbers that have yet to be seen in the West. Nwohioguy, MMA in Japan is really no different than it is in the US. Vale Tudo events were only held in the mid-90's, much like the early events in the US. Pride fighters and UFC fighters are one and the same. K-1 is kickboxing, not MMA. And there's the same amount of, or lack of, disrespect in Japan as there is in the US.