Buso Renkin is a Japanese manga series written and illustrated by Nobuhiro Watsuki. It was serialized in publisher Shueisha's shōnen manga magazine Weekly Shōnen Jump magazine from June 2003 to April 2005. The individual chapters were republished by Shueisha in ten tankōbon. It follows Kazuki Muto, who becomes an alchemical warrior in the battle against alchemical monsters known as homunculi. Watsuki envisioned the manga as his last shōnen manga, and then he tried to do as much as he could with that genre. The series has been licensed by Viz Media for North American release.