Mana is the most important human energy. There are diferent types and levels of mana that used by warriors representing 80% of the population against aryians which is an alien species invading the world to attack the human race. In this powerful world, a kid without ny mana hoping to be one day the greatest warrior of the world, the King without knowing that he himself is the son of King Leo: Ken will explore the world, meet aryians and join a warrior company.