In Year 2791 all demons, monsters and other ancient races suddenly appear, this sudden changes shoke the balance between other races and humanity so Gods grant the
humans power, called Elements and those who bear it are called Bearer. This called Bearer have classes Mage, Fighter, Pries and other classes. But there is Hidden Classes who has the intent in their own class, if you have a Class you unlock an element but the intent is that your element is more dominant power.
But when the rumble between all races occured. It is name as the Dark Age. This is the time where Earth who became Elden afterwards is in the time of despair and destruction the Gods make all races have a competition each Year to determine whose the best in individual and parties, so other powerful individuals creates Academies .To select the one whose gonna fight to they have their own fighters.