In the kingdom of Kazeus, there are two kinds of humans. One of them are normal humans while the other are humans which have powers, those with powers are called Karaens. To keep the country in balance, the King formed a government which is the Central Council. The Central Council are responsible for the supervision of the guilds.
The Council made a law stating that people in different cities of the country are to form guilds, this would ensure that humans and Karaens work together. These guilds would protect and do missions requested by the people who are not in any guild. They are known as Light Guilds.
However, there are people who abuse this law. Dark guilds are formed despite the warnings given by the Council. The aim of the dark guilds are to strike fear in people and to do assassination requests. They are hated by most people and constantly feared.