Based on my very limited exposure to Japanese culture, I'm pretty sure there aren't many things more popular there than karaoke bars, sadistic game shows and weird pixelated pornography.
I don't know how it took so long for them to combine all three.
The concept of the show, called "Sing What Happens," is fairly simple: Guys sing karaoke as a woman does hand stuff until their tone begins to warble. It might be a game show, but there's really no way to lose.
According to the video's description, the show runs on a premium adult channel, so it's worth noting this isn't what comes on after the Japanese version of "Jeopardy!."
If you're curious, that would be the Japanese version of "Wheel of Fortune."