If you can provide a screenshot or more info about the contents, I can help you find the story!
Without downloading and extracting the file, the specific story of "Jumpstar" cannot be verified. However, projects with names like this often fall into these categories: Jumpstar By POKOXEMO.rar
** .rar:** This indicates it is a WinRAR compressed archive file. You will need software like WinRAR, 7-Zip, or The Unarchiver to extract the contents to find the storyline or game files inside. If you can provide a screenshot or more