The development of the story is actually very simple, as follows:
It was a fairly tall girl from ancient times who wanted to find some grass to drag home, but she couldn't find any grass. Without paying attention, she arrived more than a thousand years later. However, the person who picked her up was a confused and pretentious female doll. Although the girl was homesick and wanted to go home, in the end...
How the specific story develops depends on the author's tricks.