Allison & Lillia is set in a world with one continent split down the middle from north-south by the towering Central Mountains, and the vast Lutoni River. Due to the geography, two cultures developed on either side of the divide. The eastern region is formally known as the Roxcheanuk Confederation, though more commonly known as Roxche. The entire region comprises sixteen countries which all speak a common language. The western region is formally known as the United Kingdom of Bezel Iltoa, though better known as Sou Beil. This region is comprised of the two kingdoms of Bezel and Iltoa which both serve to bring together a small number of countries under the same common language as with that of the eastern region.
There are very few blond-haired people in Sou Beil. At the time the story begins, it is year 3287 on the fictional universe’s World Calendar during summer. By this time, the two regions have been ragging a war for the past 130 years, though an armistice has been in effect for the past ten years. The industry and technology of the world are roughly equivalent to the 1930s.