Neighborhood

The Neighbor World is the world on the opposite side where Neighbors and Trion Soldiers come from.



This is the place Yūma Kuga comes from.

Yugo called this Planet Nation because each country travels across the sea of darkness on their own orbits. Their movement are a bit different from those of planets orbiting the sun. Many of planet nations brush by human world while revolving closer and farther. Every planet runs on a star (which itself is a Trigger). The star must be kept fuelled, or it will die, and the land would eventually crumble. When they're close to human world, they can send out their away ship and open the Gate to carry out invasion. Following this diagram, they have four planet nations currently approaching to human world like Liberi, Leoforio , Khione and Aftokrator.

Some of planet nations havent fixed orbits and can fly around freely in the Neighborhood, they called Errant nations.



Geography
There are currently 7 known nations:
 * Calvaria: A defense nation which was at war with Spinthir.
 * Spinthir: A nation which was at war with Calvaria.
 * Liberi: The maritime nation surrounded by a rich, vast sea.
 * Leoforio: The cavalry nation where battles are fought on special Trion Soldiers.
 * Khione: The snow country where harsh terrain and climate thwart enemies from attacking.
 * Aftokrator: The god's country and the largest military state.
 * Menoeides: The nation which the Expedition Force, consist of Tachikawa, Fuyushima and Kazama Unit, departed from in the Black Trigger Retrieval Arc.