Partly it was the location: An upper floor of a building in a neighborhood full of bars and pachinko parlors, which seemed much sleazier to me then than it would now.

But more it was, I think, that I didn’t understand yet why Japanese college students and office workers would pay money to practice English with me and a few other recent foreign arrivals. The fact that much of the conversation consisted of the customers asking me personal questions—“Where are you from?” “Why did you come to Japan?” “Do you like Japanese women?”—made me suspicious, too.

In retrospect, the place was almost certainly not a front for anything sinister but just a way for the owner to try to make some money from the shortage of opportunities to speak English in Japan. And the focus on personal questions was just a sign of the customers’ limited repertoire of conversational English. But it took me a while to grasp all that.

A lot of english conversation in Japan functions as de-facto paid compansionship. It's not exactly a front for escorting, but it's not completely not that either. In the west there tends to be a clear sharp line between customer service and sex work, whereas in Japan there is much more of a sliding scale from paying by the hour to hang out in a bar with friendly bar staff, to having more flirty conversations with them, through clothed touching to what's essentially a strip club experience.