Shiroihako:
"Nice to meet you Sarah! I'm Shiroihako, hollow hunter and occult investigator for hire! Wheres your parents or did they....? I apologize if I'm bringing up anything painful..."
Shiroihako naturally assumes that her parents must've taught about this sort of stuff or something. There must've been some reason her family had been attacked, but she needs to figure out what she can do to help this child as much as she can, its only what a heroic Ronin would do.