Martial Arts legend Fumio Demura studied under Japanese master Ryusho Sakagami and Okinawan master Kenshin Taira. Demura has won the All-Japan Karate Free-fighting Championships (1961), twice been voted into the Black Belt Hall of Fame and is recognized the world over as one of the premier martial artists of all time. Martial Arts legend Fumio Demura studied under Japanese master Ryusho Sakagami and Okinawan master Kenshin Taira. Demura has won the All-Japan Karate Free-fighting Championships (1961), twice been voted into the Black Belt Hall of Fame and is recognized the world over as one of the premier martial artists of all time. Kobudo Bo: Karate Weapon of Self-Defense features grasping, striking, blocking, kata, maneuvering and applications.