Angura Kei (Underground Style) is often classified as sub-genre within visual kei. However, in actuality, Angura Kei finds its roots way back during the 60's. The word 'Angura' is a Japanese abbreviation of the word 'underground'. The concept was first applied by independent Japanese theatre companies who wanted to create something uniquely Japanese. This was almost a 'counter-culture' movement, with aims to challenge the authenticity of so-called 'traditional' genres as well as the westernization that had swept across Japan since the industrial age. In similarity to EroGuro, themes are often of a sexual nature, though more in response to the free love movements of the 60's.