It could work on demons. They are close to being like spirits, but definitely fundamentally different enough that it could be plausible to at least be somewhat effective.

[ He nods at Yoite's few words, there. ]

Indeed you can. Let us do our best...

[ Pause. ]

By the way, I met a ghost in a certain week, not too long ago. His name's Captain Salvatore Brigante... said he owned a ship, called the Amarissa. You haven't seen a large orange ship, have you?

[ DOUBTS IT. But this is how he can branch into more discussion, he thinks. ]