In 2078, the moon was shattered by a meteorite, and lunar fragments were scattered all over the earth. . .
The Earth is constantly impacted by lunar fragments, causing various disasters, including tsunamis, volcanic eruptions, and floods. . . .
Later, unknown rays irradiated the earth, causing large-scale mutations in the earth's creatures.
The last strength in the world is gathered together to form the last line of defense. . . . .
