Set in a fictional world of Yden, where an inexplicable phenomena, known as Magic, existed. It is mainly divided into four regions, each separated by vast forests and great lakes. The story is mainly set in the Western region, particularly in the Arcadian Empire, one of the largest and one of the most powerful nations in the continent. In this world, all living beings possess an essence known as Mana, that when someone managed to harness it's potential, it can grant them supernatural abilities. An individual's mana can be restored with feeding and rest, but once the mana inside their bodies is fully exhausted, it causes their death. Among those who can perform magic using their mana are called Mages, and they are treated as a commodity in several nations in the whole continent of Yden.