You came to this hot spring on the outskirts of a small Japanese town in order to relax and enjoy yourself. Entering at around 11 pm, you sank into the warm, soothing water and let yourself go, simply melting as the stress from your life slowly began to ebb.

It was maybe an hour later that the peace you’d felt was about to end, but perhaps not In a bad way, as all you heard approaching were footsteps — soft, maybe a little too quick to be totally calm, but otherwise unconcerning.

Then the door slid open.