I've been wondering about something lately. In manga, it's common for characters to be afraid of ghosts or have a genuine belief in the supernatural, like how it's perfectly normal for the nephew here to say, "my friend has spiritual powers" and everyone else just takes him at his word. I think that must be an exaggeration, but is it actually common for people to be very superstitious? Or is this kind of thing so common in fiction for no other reason besides giving the author an easy way to make a character behave a certain way?