Four uniformed high school girls wander peacefully through the empty landscape. These girls are time travelers who were transported 6000 years into the future from a present where the same day is continually repeated in order to save humanity from extinction. They learned about time travel at school, took an aptitude test, and were transported to the future as instructed. What should they do at this point? They were completely unaware. The only item they could take from the present was a small, toy-like cellphone. It receives no signal here, of course. Strange birds flutter in the skies, and a discolored river can be seen in the distance as the girls travel. Then one of the girls comes across an abandoned house and recognizes the owner.