What is a soul? Actually, everything begins here.
Grand Monde was a beautiful country… until it came under attack by the Diables.No one knows where the Diables came from, how they arrived, or what they truly are.All that is known is that they have extraordinary control over souls, and in this universe, the power of souls flows into magic.
Magic is divided into dark and light; typically, the Diables wield dark magic, while humans use the light.
The most powerful of the Diables is their king, ???.The most powerful of humans is the sacred hero, ???.The sacred hero is chosen and blessed with unique powers to defeat the Diables, mastering all aspects of light magic.
The king of the Diables, however, is a being of unparalleled strength, capable of using all forms of magic. The limits of his power are unknown.
But one day, the sacred hero challenges the Diable King—for the lives of both humanity and the Diables.The battle lasts approximately ten hours.In the end, however, the sacred hero prevails, wielding the sacred sword ???.
The sword is so light that its swift strikes render the hero nearly invincible.Yet the king is not killed. He cannot die, for his power is beyond mortality.Thus, the sacred hero sacrifices their life to seal both the king and the Diables.
Grand Monde, now free from the Diables, becomes suitable for human life.Of course, weaker Diables still occasionally attack.You may ask, "Weren't they sealed too?"The answer: No. Their souls were too small to be sealed—like flour slipping through a sieve.But this wasn't a major problem.
To address it, wizards were trained, and holy knights were educated.Everything was going smoothly… until that child was born.