Only Shinnosuke could open up a doorway to the past by digging a hole in the yard! The Noharas find themselves transported back to Japan's Civil War Era, in the middle of a castle siege. A guy by the name of Stinkpoop is out to kidnap a princess in exchange for a valuable scroll. It's up to Shin and his family to save the day! Will their actions in the past turn the present into a big mess?