Koga Ninjitsu is a martial arts institution teaching the guiding principles and techniques of Koga Ryu ninjitsu and other associated and appropriate martial art disciplines.
Koga Ninjitsu is not affiliated to any other martial art, since this term means that the students of Koga Ninjitsu are also students of the affiliated style. Rather Koga Ninjitsu uses the term "associated", which means that through an association with relevant and appropriate martial arts, there is an exchange of information that supports the guiding principle of natural growth. Koga Ninjitsu instructors are encouraged, and some specific cases may be supported, to study other styles of martial arts to a proficient level that information can be brought back to the Koga Ninjitsu syllabus for analysis, understanding and possible amendment of the Koga Ninjitsu syllabus. It must however be noted that Koga Ninjitsu takes great care in this analysis before any changes are made to the Koga Ninjitsu syllabus.