On a star that we don't know about and have never detected, there is a group of stellar life forms that look exactly like us. The "elves" among them are a strange race that has the ability to control at least one kind of supernatural power. In this world, technology far exceeds the imagination of humans on earth. However, it is thought that a biochemical accident has left this beautiful star barren of life, causing death The people who left became undead, and the Undead War broke out. The surviving humans had to take the "Ya" interstellar battleship to live in other places. After passing through one galaxy after another, they finally arrived at our earth. However, because they lost their return energy, they had to temporarily station at the Lagrange point of the earth. What awaits them is to continue wandering in the vast universe, or to return to their homeland?