I was instantly curious as to what these guys were about...they looked like they were in the same vein as Lordi and GWAR, and wouldn't you know...they really are.
They are...Seikama-II, or 聖飢魔Ⅱ in Japanese.
Taken from the wikipedia:
"SEIKIMA-II (seikimatsu) translates to "End of the Century". According to the mythology created by the band to promote their music, the band members are a group of demons preaching a religion in order to propagate Satan through the use of Heavy Metal. Each member is a demon of a different hierarchical class with His Excellency Demon Kogure being leader of demons and His Majesty Damian Hamada being crown prince of hell. In accordance to the prophecy and after completing the world conquest, the band would disband at the end of the century on December 31, 1999 at 23:59:59."
The best part is, they really DID break up on December 31, 1999 at 11:59:59pm. How awesome is that?
"Kogure claims to have finished the conquest of the earth on December 31, 1999 AD. Most earthlings, however, believe he is an entertainer playing a demon."
The music itself is pretty awesomely bad...good ol' '80s and '90s style heavy metal complete with extreme costumes. The playing is sloppy, and some videos showed like three or even four guitarists playing on stage for no real reason...but anyway...yeah. Here are some more videos. I just pulled them randomly, so I haven't watched all of these.
"Save Your Soul"
"Revolution Has Come"
"Fire After Fire" (This song is actually pretty good, in my opinion)
I got a good laugh out of this.