Kurogane (黒鉄), also known as Black Steel, is a Japanese manga series written and illustrated by Kei Toume. It ran from 1996 to 2001, and consists 5 volumes and 14 chapters (which are further separated into episodes). It was released in America from June 2006 to June 2007. A sequel, Kurogane-kai, was serialized in Shueisha's Grand Jump from 2016 to 2020.