The end of the world + space + natural disaster (extreme heat + extreme cold + heavy rain + earthquake causing sea water to pour in and land disappear) + escape from the earth
The unprecedented earthquake caused the seawater to pour back and the land disappeared. The huge earthquake caused the tearing of time and space. Some survivors fell into the time and space tunnel. Jiji was one of them. She returned to the time when there were still three years before the end of the world and replaced her previous self. This time of year, you can finally prepare in advance and start a comfortable version of apocalyptic survival.
What a novel beginning