In the distant past of Munto the Magical King before he was born when the world of the Heavens did not exist, humans lived a prosperous civilization. One day, beings of unknown origins fell out of the sky and onto human world. These beings could control a power called Akuto, or human emotions. They could take the human spirit, which is an accretion of feelings, wishes and dreams and turn that into a physical power or physical object. These beings, obsessed with their powers, destroyed the human civilization within a few days. However, they did not realize that the humans created the Akuto; these beings who descended from the skies killed off the very source of their power. They then discovered several alternate universes which they could draw more Akuto from. They depleted all the other dimensions of Akuto and used it to create their own empire in the skies above the humans. This new civilization was known as the Heavens and was populated by the Heavenly Beings who could control Akuto and the Light, Dark, Fire, Water, Wind and Earth Crystals have disappear from heavens for years.
The leaders of the Heavens soon grew corrupt due to the unlimited amount of Akuto they had stolen from other planets in other space times, and the Heavens began to collapse into disarray. At this time, the humans launched an attack against the Heavens. They were the very humans that were defeated when the Heavenly Beings first showed up. The humans who supplied the Akuto then defeated the Heavenly Beings. During the battle, the leaders of the Heavens decided to sever the supply of Akuto, cutting themselves away from Earth rather than be killed by the rebelling humans. They sealed themselves into a parallel dimension in order to sever the link of Akuto, though this resulted in the pillars that connected Earth to the Heavens to fall from the sky causing massive destruction. This day was called the "Calamitous Day" when both worlds lost contact with each other. From that day on, the Heavenly Beings considered linking the two dimensions together to be a taboo and appointed a guardian to guard this link to make sure it is never connected again.
But the only one who can save the Heavens from Destroy know as Legendary Warrior of Light, Dark, Fire, Water and Earth.