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.

Demon Kakka , previously known as Demon Kogure , is a Japanese musician, songwriter, entertainer, journalist, sumo commentator, actor and voice actor. He first gained fame in the 1980s as vocalist of the heavy metal band Seikima-II, before starting a solo career in 1990 and branching out into other forms of entertainment. His real name is not publicly known and he is noted for always working entirely in character, which includes wearing face paint.