Black Heaven (課長王子, Kachō-Ōji?), also referred to as The Legend of Black Heaven and Kacho-Ōji, is a thirteen-episode anime TV series about the middle-aged members of a short-lived heavy metal band and their unexpected role in an alien interstellar war. The Japanese title of the series is a multi-layered pun; it can be translated as "section-chief Oji", "old section-chief", or literally "Section Head Prince". The opening theme "Cautionary Warning" was written and performed by English rock guitarist John Sykes, who played with rock bands including Thin Lizzy and Whitesnake. In the US, the series has been available on DVD from Geneon in four separate volumes since 2001 and in 4-disc box set since 2005. Middle-aged Oji Tanaka has a wife, a child and a mundane job as a salary man in Tokyo's modern society. But his life wasn't always so dull; 15 years ago he was known as "Gabriel", lead guitar of a short-lived heavy metal band called "Black Heaven". Oji's life takes a sudden turn ...