"SEIKIMA-II is a popular Japanese Heavy Metal band formed by Damian Hamada in 1982. They disbanded on December 31, 1999.

SEIKIMA-II (seikimatsu) translates to "End of the Century". Their history, as it has been prophesized, is that they 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."

And they're singing the theme to an anime song.