Bansenshukai

Bansenshukai (萬川集海, translated 'Sea of Myriad Rivers Merging') is a Japanese book containing a collection of knowledge from the clans in the Iga and Kōga regions that had been devoted to the training of ninja.

It was compiled by Fujibayashi Sabuji in 1676, in the early years of the Tokugawa shogunate, to preserve the knowledge that had been developed during the near-constant military conflict from the Ōnin War until the end of the Siege of Osaka almost 150 years later. As well as information on military strategy and weapons, it has sections on the astrological and philosophical beliefs of the times, and along with the Shōninki of 1681 and the Ninpiden of 1655 make up the three major sources of direct information about this shadowy profession.

The books include:

There are two versions:

After World War II, a limited number of hand written copies were offered to the public. A few of these copies are in some major national and university libraries. It has recently been re-translated in various languages including English, French, German, and Japanese.

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