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  • Koga-ryu, "School of Koga"; occasionally transliterated as "Koka") is an ancient school of ninjutsu. It originated from the region of Koga (modern Koka City in Shiga Prefecture). Members of the Koga school of shinobi (ninja) are trained in disguise, escape, concealment, explosives, medicines and poison; moreover, they are experts in techniques of unarmed combat (Taijutsu) and in the use of various weapons. History