The Possessed of Kiki Shikizaki.
His twelve masterpieces.
If they sold the lot of them –
They could all give up on being ninjas.
No more slinking around in the shadows.
They would no longer have to hide, and no longer have to endure.
Something unresolved was how they would unload the Possessed. One sword was supposedly enough to buy a country. Who had that kind of money? With the exception of an area of Nagasaki, Japan was pursuing a policy of isolation, but they would have to seek a patron overseas. While they were at it, why not move the entire clan overseas? Japan no longer had a place for them.

Katanagatari Omnibus 1, Page 76