月刊少年マガジン
is a Japanese manga series written and illustrated by Masatoshi Kawahara. The story follows a young Karate practitioner named Tsukumo Mutsu, 40th master of the deadly Mutsu Enmei Ryu style. It was serialized in Kodansha's "Monthly Shōnen Magazine" from April 1987 to November 1996. The individual chapters were collected and published into 31 "tankōbon" volumes published between October 1987 and May 1997.