Mutsu Enmei Ryū Gaiden: Shura no Toki (陸奥圓明流外伝 修羅の刻) is a Japanese historical manga published by Kodansha since 1989 and collected in 15 tankoubon volumes, in eight story arcs. A prequel series to Shura no Mon, it began serialization in the same magazine in July 1989 where it ran until November 2005. It was collected and published in 15 tankōbon volumes between February 13, 1990 and January 17, 2006. Five aizōban volumes of the series were also released between March 19, 2004 and July 21, 2004.