The Bujinkan is an international martial arts organization based in Japan and headed by Masaaki Hatsumi. The combat system taught by this organization comprises nine separate ryūha, or schools, which are collectively referred to as Bujinkan Budō Taijutsu. The Bujinkan is most commonly associated with ninjutsu. However, Masaaki Hatsumi uses the term Budo as he says the ryūha are descended from historical samurai schools that teach samurai martial tactics and ninjutsu schools that teach ninja tactics.

Uke (受け) is in Japanese martial arts the person who "receives" a technique. The exact role of uke varies between the different arts and often within the art itself depending on the situation. For instance, in aikido, judo kata, and bujinkan ninjutsu, uke initiates an attack against their partner, who then defends, whereas in competition judo, there is no designated uke.