Negishiryu Shurikenjutsu and Shirai Ryu originate in the same school: Ganritsuryu also called Ganryu , a complete school created in 1644 (20th year of the Kan-Ei. era) by Matsubayashi Samanosuke Nagayoshi "Henyasai". The curriculum of the Ganritsu tradition included: Iai, Tachi-Uchi (sword fighting method), Kodachi, Jo, Naginata, Kumi-Uchi (wrestling) and Shuriken. Negishi Shorei (founder of Negishi Ryu), Master of the sword of the Annaka clan of the current prefecture of Gunma, received the teaching of the school of Ganritsu from Kaiho Hanpei, Shihan of Hokushin Itto Ryu of the Mito clan. Negishi Shorei, whose father Negishi Sentoku was a Master of Kenjutsu of the style Araki Ryu (Annaka clan), was born in the Tempo period (1833). He created new forms of Shuriken based on the Ganritsu Shuriken in the shape of large needle (Hari). He changed the form, the weight , the thickness and filed it so as to give him an octagonal round form (in cross section). In the 4th year of the Ansei period (1857), having toured the provinces in search of adventure (Musha Shugyo) he returned to the clan and became a 4th generation Master, succeeding his father. He was very gifted at throwing Shuriken with both hands, to the point that he was forbidden to duel by local Daimyo (lord) and was called the "little Tengu" of Joshu (former prefecture of Gunma).

Shirai Ryu was created at the end of the Edo era by Shirai Toru sensei, 2nd soke of Tenshin Ittoryu, pupil of Naruse Kanji sensei, 3rd generation soke of Negishi Ryu. Shirai Ryu is a branch of Negishi Ryu.

There are three basic methods Kihon Kata: Manji, Toji, Jikishi which are carried out with different launch times.
Manji: 3 movements, Toji: 2 movements, Jikishi: 1 movement.
If the Shuriken has a direct trajectory, one calls the throw the Jikidaho throw, if the trajectory includes a half-rotation, one calls the throw Hantendaho.

Shikake Kata: method of combat launching "Sento Kata"

These are practical methods intended to be used for combat. The applied methods of combat are Muki-Have: facing the adversary, Torimai: while moving. In-Yo-Arasoi fast launching at targets located in front of, behind and Shichi the four knowledges. There are also methods of using Shuriken starting from the sitting position, lying down, with a sword, in darkness, methods of hiding it, methods of using it in close combat.

Master Saito Satoshi, at the age of 19 (in 1941, 16th year of the Showa era), became a pupil of Naruse Kanji sensei, 3rd successor of Negishiryu Shurikenjutsu, practised under the direction Negishi Rryu and Shirai Ryu Shurikenjutsu [French not very clear here], also practised with Narusei Sensei Kuwana Handen Yamamoto Ryu Iaijutsu. In 1959 (Showa 34), 4th soke Maeda Isamu sensei, passed on the titles of soke of Negishi Ryu and Kuwana Handen Yamamoto Ryu Iaijutsu to him, and after the war he learnt Shingetsuryu Shurikenjutsu from Master Fujita Seiko, 14th successor of Kogaryu Ninjutsu, and became a permanent member of the administration of Nihon Kobudo Shinkokyokai (Association for the promotion of the Japanese Traditional Martial arts).