Posts which depict Konpaku Youmu as being afraid of ghosts. This, despite being half-ghost herself, despite being in possession of a sword which can slay ghosts, and despite living with and working for the princess of ghosts.
There does not have to actually be a ghost, and if there is a ghost, it does not have to be real or even non-fictional. Youmu need only be afraid at the thought of there being a ghost, or be experiencing a ghost story.
Does not count if Youmu encounters a ghost that she attempts to defeat, but her abilities fail to defeat it. She has every right to be afraid of that.