Gyokko-ryū
Gyokko-ryū is a school of Japanese martial arts that specialises in kosshijutsu, shitōjutsu and ninjutsu. Gyokko-ryū was founded by Tozawa Hakuunsai Hogen in the Heian period. The sōke title is claimed to be passed down to Tetsuji Ishizuka from Masaaki Hatsumi who in turn received it from Toshitsugu Takamatsu. Tetsuji Ishizuka has died on March 15, 2025, no successor has been appointed yet.