The longer you look around in the dark, the more you see things that you
wouldn’t like to see.
In the Japanese mythology, there is Betobeto-san who is the spirit of this
premonition: it follows lonely night walkers. Its presence can be sensed, but
it can not bee seen even if you turn around and look. Betobeto-san is not
aggressive or hostile, but it gives you a mixed feeling - its mere existence is