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Koppojutsu (骨法術) is a Japanese fighting system included in the Bujinkan Budo Taijutsu organization. The term Koppo is commonly expressed as "bone-breaking". However, the representative kanji mean "bone" (骨) and "method/ law/ rule" (法), respectively: therefore, another possible interpretation is "bone-method".


Koppojutsu teaches its students how to attack directly to the core of a threat. On the simplest, and purely physical level, this means attacking an enemy's skeletal system (the core frame of his body). When the bone structure of the opponent is compromised, he loses the ability to use his body properly, and the ability to breathe and think properly due to the high degree of pain caused by each attack. But most importantly, he has lost completely the will to fight.

To accomplish these strikes, precise weak points are targeted, sometimes with the thumbs or fingers; therefore, the strikes themselves do not damage the skeleton, but rather manipulate it into a position of weakness. This can be done with both hard striking techniques and grapplig techniques, such as throws, joint locks and so forth.

The traditional schools of Koppojutsu offered by the Bujinkan system are Koto Ryu (虎倒流; Knock Down Tiger School) and Gikkan Ryu (義鑑流; Justice and Loyalty School).

In the Tekken series

Nina Williams and Anna Williams are Koppojutsu pratictioners in the series. Storyline-wise, their father was a former assassin who implemented Koppojutsu in his assassination techniques, while their mother was a British Aikido champion. Their fighting style is a blending of these two martial arts.


  • Combot - Tekken 4 only; through mimicry.


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