The place, where I arrived, was strange. It was in a dark, narrow alley somewhere in Tokyo. There was a neon sign in front of it which translated to a "Bubble heaven". It was a bathhouse, at least officially.
To get inside I turned into a bug, and flew in, just to experience the true nature of that establishment. It was a brothel, where women would, on top of the standard 'washing your back' offer additional services.
I guess the guy I was looking for was a returning customer there. I found him almost perfectly at the time I was supposed to look for him.
I did the exploration, got outside, then waited, observing from the wall. He came walking from a nearby parking lot, then went inside. He had an appointment, but I wasn't really keen on watching him fuck some girl, so I just stayed outside until he came out, then followed transforming myself into a crow to keep up with his speed.