Bansenshūkai

Bansenshūkai (萬川集海, Ten Thousand Rivers Flowing Together to form an Ocean) (Also pronounced Mansenshukai) is a 1676 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.

[1] Bansenshūkai summarizes the main points of the three volumes of the original Ninjutsu book Kanrinseiyō (間林清陽), and was written by selecting only those that fit the times.

[2][3] The book was compiled by Fujibayashi Yasutake 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.

The books include: There are two versions: Toward the end of the 18th century, representatives from Koga petitioned the shogunate for a stipend.

After World War II, a limited number of handwritten copies were offered to the public.