Re: ROAD TO ROKAFOSU
"This is a bad omen, a Jorōgumo may be close as these were probably her minions. We should flee, there is no reason to confront her."
The Jorōgumo is a spider-woman that can shape-change. She has magical powers and can place curses on people. While they do not actively pursue contact with humans, any that happen by her path will surely suffer for meeting. Such a creature usually resides near a waterfall.
You are still in the lands ruled by the Michizane clan. It would be an honorable thing to clear any such creature from the land, though not required. You could, instead, report it to the authorities of the land for them to manage.