If the earth can be compared to a train running on a track, and there is a serious problem with the track at this moment, the train (earth) is in a sense of self-protection and starts to run in the opposite direction, gradually rewinding time until the train (earth) returns to the most primitive ecological environment, and the evolutionary history of humans and the earth starts from scratch.
And what kind of story will happen when the girls chosen by fate return to a time when history stopped developing? Should we continue to follow the original history, or will we continue to change and eventually change the original trajectory of history?