This world, a world that had entered into its dark period, a time when wars between people, wars between races, and territorial wars, as well as pandemic outbreaks that spread at that time. Not only killing, but destroying the existing ecosystem.
The earth became desolate, and unlivable, crops failed, livestock died of hunger and drought struck all over the world.
But a hero was summoned from another world, he was called the savior, who would bring fertility to the world, save humanity, and expel Satan from the world, and lock him back into their home world. The hero is the Ascent that came from Heaven, and it happened about 22,000 years ago.
Now that mankind has prospered, they no longer believe in the coming of the "Savior" and exaggerate their status to exceed the Creator, they are swallowed up by ego, and worldly favors. Not knowing that the Savior has come, and will rectify the "crisis" in the world.
Argonaut... the savior, and destroyer of all.