On a normal afternoon, Doraemon's bell was stolen by Kaito Deluxe, a thief from the 22nd Century. Determined to get it back, Nobita and co. decides to pursue him and take back the bell that is hidden inside the 22nd Century's Secret Gadget Museum. (Source: ANN)

One day, Nobita picks a small rocket from which a small-sized humanoid alien named Papi comes out. He comes to Earth from a planet name Pirika to escape its evil PCIA army. At first, Doraemon and his friends are confused by Papi's small size, but with the gadget "Small Light", they shrink and play together. However, the whale-shaped battleship which was chasing Papi comes to Earth and attacks them. Papi blames himself for having involved everyone but, tries to fight against the PCIA army. In order to protect Papi and his planet, Doraemon and his friends travel to Pirika.

Striking fear into the hearts of mortals, the Demon Lord Satan begins to conquer the land of Ente Isla with his vast demon armies. However, while embarking on this brutal quest to take over the continent, his efforts are foiled by the hero Emilia, forcing Satan to make his swift retreat through a dimensional portal only to land in the human world. Along with his loyal general Alsiel, the demon finds himself stranded in modern-day Tokyo and vows to return and complete his subjugation of Ente Isla—that is, if they can find a way back! Powerless in a world without magic, Satan assumes the guise of a human named Sadao Maou and begins working at MgRonald's—a local fast-food restaurant—to make ends meet. He soon realizes that his goal of conquering Ente Isla is just not enough as he grows determined to climb the corporate ladder and become the ruler of Earth, one satisfied customer at a time! Whether it's part-time work, household chores, or simply trying to pay the rent on time, Hataraku Maou-sama! presents a hilarious view of the most mundane aspects of everyday life, all through the eyes of a hapless demon lord.

Doraemon created a hideout for everyone in an underground cave and Suneo got lost. Everyone came back out except Suneo. After finding out that he was lost the entrance was broken. They have to find another entrance to the caves and end up in a dinosaur world. Vanho , a soldier rescued them and said that he found Suneo. When they found Suneo they found out about Vanho's people's plans. Their plan it to study Doraemon's group as human specimens and take over Earth's suface . (Source: ANN)