The location of Black Street is deep beneath the city and is a place where filth flows freely.
The filth expelled from the main city naturally flows into underground passages.
These passages not only keep the main city clean but are also places for slaves to survive.
Not every slave has a master; the title of 'slave' means they are slaves to the entire Eight-Eyed Divine Race.
As slaves, naturally, they do not have the privilege to live above ground; the only place they can live is Black Street, this dirty underground.
Therefore, when constructing the passages, they were deliberately made larger, as if there's a city underground.
Below the ground, it's very dim, with only a few tiny ventilation openings letting in some sunlight.
The slaves of Black Street live in such conditions underground.
Whenever someone needs slaves, they are captured and sold from Black Street.
Black Street has its owners, divided into different areas, each maintained by different slave masters.
