Wrestling of Darkness 666 , also known as the Wrestling of Darkness Organization 666 and often referred to simply as 666 or Triple Six, is a Japanese professional wrestling promotion based in Shinjuku, Tokyo, Japan. The promotion was founded in 2003 by Onryo and Qp-Crazy frontman The Crazy SKB.

Koju Takeda is a Japanese professional wrestler currently working as a freelancer and preponderently for the Japanese promotions DDT Pro-Wrestling and Wrestling of Darkness 666.