The time of the world keeps moving forward, and everything has its own end. Even if time is endless, everything it represents cannot be as eternal as it is.
Aigaras, the name of this world, the sky in Aigaras world is red, the earth is black, and there is gray-black fog everywhere. This world is already dead. However, there is a group of "light" at the center of this world. In this perished world, "light" is the only thing that survives. However, nothing is immortal, even though it exists longer than anything else, just a long time. "Light" appears at the same time as the world of Aigras, but is destroyed before the world of Aigras. This is the rule.