L-04 is an area surrounded by the ocean. The islands that are in the sea, or even those on it, live with a bubble that protects them. In L-04, all races that exist in Yamani live and work there peacefully; they respect each other and never discriminate between races.
After all, the only race that has been discriminated against in Yamani so far has been the human race.
However, ever since the disappearance of humans in the Yamani subsoil, the area has now started to tense up a bit, in particular for those who live on the subsoil's ceiling. In L-04, there is actually not too much difference in degrees; all kinds of creatures can live there and are free to choose any area. However, most of those who are known as merchants usually live on the ceiling of L-04, separated from the mainland, and have bubbles on their own small island.
