, previously known as , 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. Early life and education Demon attended kindergarten up through his first year of elementary school in New York City. He moved to Tokyo for second grade of elementary school, before moving to Nishi-ku, Hiroshima in 1971 for three years. Returning to Tokyo, Demon grew up there from 6th grade on. Between 1982 and 1983, Demon attended an acting school in Tokyo. In March 1986, Demon graduated with honors from Waseda University with a degree in social science. A fan of sumo since childhood, he was a member of the university's sumo club. He was also a member of their folk song club. Career Music When Sunplaza Nakano-kun left the Waseda University rock band Super Slump to form Bakufu Slump, Demon replaced him as vocalist. Demon and fellow Waseda University student Damian Hamada formed the heavy metal band Seikima-II in December 1982. The band saw numerous lineup changes in their career, with Demon being the only constant member. They signed to CBS/Sony and released their first album Seikima II – Akuma ga Kitarite Heavy Metal in 1985. Seikima-II went on to release 12 studio albums and sell over 10 million records. In accordance to their fictional "prophecy" and after completing their "world conquest", Seikima-II disbanded at the end of the century on December 31, 1999 at 23:59:59. They have held various limited time reunions since 2005, and released their first album of new material in 23 years in 2022. Demon released his first solo album in 1990, and after Seikima-II disbanded focused on his solo career. In 1994, Demon appeared on Larry King Live, becoming the first Japanese musician to do so. In January 2007, Demon released Girls' Rock, a cover album of rock songs by female artists. He released a follow-up, Girls' Rock √ Hakurai, in January 2008 and supported it with a national tour from April to May. A third female rock cover album, Girls' Rock ~Tiara~, was released on February 11, 2009. The compilation album Girls' Rock Best,