Neptune

In the extra dimension, there are four nations called "Planetune", "Rastation", "Levi", and "Linvax".and each country has four goddesses, "Neptune," "Noire," "Blanc," and "Vert," who rule like emperors. They basically compete for supremacy over the Cher, which is the source of power and the support of the people, but they get along well and even fight together when the world itself is in danger of being destroyed.
Each country is located on land, and there is also an ocean. The world is divided into two continents, with Planeptune in the west, Lowee in the north, Lastation in the east, and Linbox in the south on the smaller continent.