I'd go for Shinano, mostly because it is a great place to raid from. Uesugi will suddenly find himself with 6 extra border provinces to defend, and he'll probably go nuts trying to take Shinano back.
That geisha is out there. She can't be bargained with. She can't be reasoned with. She doesn't feel pity, or remorse, or fear. And she absolutely will not stop, ever, until you and all your heirs are dead.
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