>>3718767They way I see it is that to a casual western viewer Nijisanji has traditionally been the part of town that's known to all locals but isn't on most tourist maps, and where the occasional curious out-of-towner wanders in through some alleway or another to find all kinds of strange-looking people and weird-ass shops and stalls that look interesting but everything is in a language they can't understand properly.
Most people wander and look around for a while before eventually heading back, a smaller number find it fascinating enough to keep visiting and spending time learning about and looking through the place more thoroughly, and a few grow fond enough of it to decide they want to stick around for good.