Incriminating Handprint

From: Hanako
Description: You’ve found items that bring death: a teapot of poison, a brush with a needle, a cursed wish, a suffocating incense, and an explosive inkwell. But this didn’t pacify the onryo spirit, so she must have died in another way. I’ll try to figure it out with some artifacts.
Completed: The artifacts’ magic reveals to me that the items you found were created by one person, and I see their handprint on the hilt of the sword that killed the onryo. This handprint belongs to... the ghost woman herself! She took the sword, wanting to strike someone with it, but tripped and fell on the blade.