There`s documents lying around all over the game, and when you find them you read them on your computer at HQ. Such ghosts as Yourei and succubus have secrets in their infos. Also the tall lady
an example of a document, (didn't understand)
But I know about the tall lady and bansheep secret animations
Well, there`s that document i was talking about, but apparently it has no clues on how to unlock that scene. Sorry for mislead xD
It only appears in English language not spoilerish. I haven't copied the edited information for them.