I don't know when, as if it broke through from a two-dimensional plane to a three-dimensional one, a plane appeared on the earth. The emergence of planes alleviates the conflict between humans and the limited space of the earth, and opens up a broader space for the survival of living things. No one knows why the plane appears, but the plane has its own life cycle: once the ecological circle it carries is irreparably broken, the plane will collapse and close, and the creatures that thrive in it will have to find another place. If you are lucky, you can find a new plane, but if you are unlucky, you can only wander around, or even stay in the closed plane, becoming nourishment to breed a new plane.
Intention: None