Gikan ryu

Gikan-ryū Koppōjutsu (義鑑流骨法術) is a medieval Japanese school of martial arts allegedly established in the 16th century by Uryu Hangan Gikanbo (瓜生判官義鑑坊). Koppōjutsu means attacks against bones.

Gikan-ryū Koppōjutsu is based on martial arts skills and techniques that Uryu Hangan Gikanbo learned from Sougyoku Kan Ritsushi, Soke of Gyokko-ryū and Kotō-ryū, one of the inputs for the Ninjutsu of the takamatsu den schools.