I felt the same. There was practically no detective work in this one, since they didn't even show how Yakumo deduced the haunting effects were fake. Other than having the motivation to prove them false to serve his opinion of what ghosts are and are not.
Still, I didn't particularly mind this episode. As this tries to be a somewhat logical show, a necessity for detective stories, in the end, they needed some reason for Haruka to stick around. And what's better for that than to take an example of a geezer who screwed up his own love story by ignoring his feelings until it was too late.
Let's hope the rest of the eps are more suitable for the genre.