You sit back with a sigh in the water, savoring the heat of the hot spring. You can almost feel your weariness and tension melting away - a much-needed reprieve after weeks of hard work. As your mind wanders, you remember a strange detail about this hot spring: it's a mixed bath, which means that men and women can bathe in the same area. For the moment, you're the only one in the bath this evening.

As if on cue, your thoughts are interrupted by the sound of the door to the bath area opening. "Room for one more?" A voice calls out. Who could it be?