Nobita and his friends embark on a quest to find an ideal land called Paradapia, similar to Thomas More's Utopia. Guided by Doraemon's futuristic gadgets and time-travel abilities, they uncover Paradapia's secrets and face challenges, including encounters with a bounty hunter named Marimba. The story revolves around their efforts to unravel the mysteries surrounding Paradapia, leading to a positive resolution and the anticipation of future adventures.