The Oniwabanshuu was an elite of ninja who were at guard of the Edo Castle during the Togukawa
Era.
For hundreds of years the IGA (Togakure) group of ninja were the major force in Ninjitsu, however smaller groups existed in other parts of
Japan. Within these groups of spies, saboteurs, and killers, another
family incread its power, namely the deadly KOGA of Shiga prefecture.
Interestingly, Shiga is next to the Mie prefecture in southern
Japan. So, the KOGA and IGA inhabited the same mountain range, in two valleys divided by a mountain.
During the centuries, several leaders such as Takeda Shingen, Oda Nobunga, and perhaps the greatest general in Japanese
History, Tokugawa Ieyasu all employed the Ninja to help control the country through a complex spy network.
With the close of the Sengoku era in 1600, three hundred years of
peace and prosperity followed, known as the Tokugawa era. Up until this time the capital of
Japan had been in Kyoto, but Tokugawa moved the capital to Edo (Tokyo today). He took with him three hundred Ninja from the KOGA and IGA groups as personal bodyguards. So the 'Oniwabanshuu' group of ninja
set, not as an espionage
unit, but as an internal security
unit. Later these Ninja guarded the castle in Tokyo.
At the present time The Oniwabanshuu exists as a real life guild with all around the world members.