Seikima-II

is a Japanese heavy metal band, formed in 1982. Throughout their career they have had numerous lineups, with lead singer Demon Kakka the sole constant member. The group has sold over 10 million records in Japan alone.

The band members each wear face paint and elaborate stage outfits and have adopted fictional personas for the purpose of theatrics. According to their fictional backstory, Seikima-II are a group of from the futuristic hyper-evolved dimension that preach a religion called in order to propagate Satan through the use of heavy metal music. Each member is a demon of a different hierarchical class, with His Excellency Demon Kakka being leader of the Akuma and His Majesty Damian Hamada being the "Crown Prince of Hell". In their backstory and songs such as "The End of the Century", Seikima-II prophesied that they would conquer the world for the forces of evil and, after successfully completing the task, would disband at the end of the 20th century. This story culminated in 1999 with a series of three consecutive concerts called The Black Mass Final 3 Nights on December 29–31, with the last known as "The Doomsday". In accordance to the fictional prophecy and after completing their "world conquest", the band disbanded after the third concert at the exact end of the century on December 31, 1999, at 23:59:59 JST.