Seilfall

Seilfall is the other world where Ryouma Takebayashi was reincarnated by the gods Gain, Kufo and Lulutia after his death on Earth. His presence in the land is to help replenish the diminished mana of the world.

Rifall
The kingdom the Gods sent Ryoma to due to the country being more tolerant of the social gap between commoners and nobility and being easier to live in compared to other countries.

Gilmar
A country that has been at war with itself for a very long time.